Leadership

The knowledgeable, experienced and strategic management team and Board of Directors at Pioneer guide the company's success. Learn more about our leadership by clicking a name below and by visiting our Governance section.

Management Team

Scott D. Sheffield »

Chairman and Chief Executive Officer

Scott D. Sheffield

Chairman and Chief Executive Officer

Mr. Sheffield has held the position of Chief Executive Officer for the Company since August 1997 and assumed the position of Chairman of the Board of Directors for the Company in August 1999. He was President of the Company from August 1997 to November 2004. Mr. Sheffield is a distinguished graduate of The University of Texas with a Bachelor of Science degree in Petroleum Engineering. He was the Chairman of the Board of Directors and Chief Executive Officer of Parker & Parsley, a predecessor of the Company, from January 1989 until the Company was formed in August 1997. Mr. Sheffield joined Parker & Parsley as a petroleum engineer in 1979, was promoted to Vice President - Engineering in September 1981, was elected President and a Director in April 1985, and became Parker & Parsley’s Chairman of the Board and Chief Executive Officer in January 1989. Before joining Parker & Parsley, Mr. Sheffield was employed as a production and reservoir engineer for Amoco Production Company. Mr. Sheffield also serves as a director of Santos Limited, an Australian exploration and production company.

Timothy L. Dove »

President and Chief Operating Officer

Timothy L. Dove

President, Chief Operating Officer and Board Member

Mr. Dove became a Director of the Company in May 2013 and has served as the Company’s President and Chief Operating Officer since December 2004. He held the positions for the Company of Executive Vice President and Chief Financial Officer from February 2000 to November 2004 and Executive Vice President - Business Development from August 1997 to January 2000. Mr. Dove earned a Bachelor of Science degree in Mechanical Engineering from Massachusetts Institute of Technology in 1979 and received his Master of Business Administration in 1981 from the University of Chicago. Mr. Dove joined Parker & Parsley, a predecessor of the Company, in 1994 as Vice President and was promoted to Senior Vice President - Business Development in October 1996, in which position he served until the Company’s formation in August 1997. Before joining Parker & Parsley, Mr. Dove was employed with Diamond Shamrock Corp and its successor, Maxus Energy Corp., in various capacities in international exploration and production, marketing, refining, and planning and development.

Mark S. Berg »

Executive Vice President, Corporate/Operations

Mark S. Berg

Executive Vice President, Corporate/Operations

In April 2005, Mark Berg joined Pioneer Natural Resources to serve as Executive Vice President & General Counsel. He was promoted to Executive Vice President, Corporate in January 2014, and named Executive Vice President, Corporate/Operations in August 2015. Mark’s corporate responsibilities include oversight of Legal, Land, Regulatory Affairs, Government Affairs and Corporate Communications. In operations, he is responsible for Pioneer’s vertically integrated service companies: Pioneer Pumping Services, Premier Silica and Pioneer Well Services.

Berg began his career in 1983 with the Houston-based law firm of Vinson & Elkins L.L.P. and served as a partner from 1990 through 1997. He served as Executive Vice President, General Counsel and Secretary of American General Corporation, a Fortune 200 diversified financial services company, from 1997 through 2001. Subsequent to the sale of American General to American International Group, Berg was appointed Senior Vice President, General Counsel and Secretary of Hanover Compressor Company, a NYSE company specializing in natural gas compression and processing.

Berg received his Juris Doctor, with honors, from the University of Texas School of Law, and graduated magna cum laude and Phi Beta Kappa with a Bachelor of Arts in Public Policy from Tulane University.

He is a member of the State Bar of Texas. Berg also served as Chairman on the Board of Dallas CASA.

Chris J. Cheatwood »

Executive Vice President, Business Development & Geoscience

Chris J. Cheatwood

Executive Vice President, Business Development & Geoscience

Mr. Cheatwood was elected the Company’s Executive Vice President, Business Development and Geoscience in November 2011. Mr. Cheatwood had previously served the Company as Executive Vice President, Business Development and Technology since February 2010, as Executive Vice President, Geoscience from November 2007 until February 2010, as Executive Vice President - Worldwide Exploration from January 2002 until November 2007, as Senior Vice President – Worldwide Exploration from December 2000 to January 2002, and as Vice President - Domestic Exploration from July 1998 to December 2000. Before joining the Company, Mr. Cheatwood spent ten years with Exxon Corporation. Mr. Cheatwood is a graduate of the University of Oklahoma with a Bachelor of Science degree in Geology and earned his Master of Science degree in Geology from the University of Tulsa.

Richard P. Dealy »

Executive Vice President and Chief Financial Officer

Richard P. Dealy

Executive Vice President and Chief Financial Officer

Mr. Dealy was elected the Company’s Executive Vice President and Chief Financial Officer in November 2004. Mr. Dealy held positions for the Company as Vice President and Chief Accounting Officer from February 1998 to November 2004, and Vice President and Controller from August 1997 to January 1998. Mr. Dealy joined Parker & Parsley, a predecessor of the Company, in July 1992 and was promoted to Vice President and Controller in 1996, in which position he served until August 1997. He is a Certified Public Accountant, and before joining Parker & Parsley, he was employed by KPMG LLP. Mr. Dealy graduated with honors from Eastern New Mexico University with a Bachelor of Business Administration degree in Accounting and Finance.

J.D. Hall »

Executive Vice President, Permian Operations

J.D. Hall

Executive Vice President, Permian Operations

In August 2015, Joey Hall was appointed Executive Vice President, Permian Operations for Pioneer Natural Resources. He is responsible for planning, development and operations activities in the Permian Basin. He is also a Member of Pioneer’s Management Committee.

Prior to this role, he served as the Executive Vice President, Southern Wolfcamp Operations starting in September 2014. Hall was instrumental in leading Pioneer’s development of its Eagle Ford Shale assets starting in 2010 as the Vice President, Eagle Ford Asset Team and Sr. Vice President, South Texas Operations.

Before leading South Texas operations, Hall was the Operations Manager in Alaska where he was responsible for all drilling, production and construction activities. During his time in Alaska, Pioneer completed the Oooguruk development, establishing Pioneer as the first independent oil and gas company to produce on the North Slope of Alaska.

Hall previously held several positions in Worldwide Facilities, where he managed offshore, onshore and international projects across the Company, including the Falcon deepwater development in the Gulf of Mexico. He began his career with a predecessor company, MESA, Inc., in 1989.

Hall has a Bachelor of Science degree in Mechanical Engineering from Texas Tech University and is a Registered Professional Engineer in Texas.

Danny L. Kellum »

Executive Vice President, Permian Operations

Danny L. Kellum

Executive Vice President, Permian Operations

Mr. Kellum, was elected the Company’s Executive Vice President - Permian Operations in February 2010. Mr. Kellum had previously served the Company as Executive Vice President - Domestic Operations since May 2000, and as Vice President - Domestic Operations from August 1999 until May 2000, and Vice President - Permian Division from August 1997 until December 1999. Mr. Kellum joined Parker & Parsley, a predecessor of the Company, as an operations engineer in 1981 after a brief career with Mobil Oil Corporation, and his service with Parker & Parsley included serving as Spraberry District Manager from 1989 until 1994 and as Vice President of the Spraberry and Permian Division until August 1997. He received a Bachelor of Science degree in Petroleum Engineering from Texas Tech University in 1979.

Kenneth H. Sheffield, Jr. »

Executive Vice President, STAT, WAT and Corporate Engineering

Kenneth H. Sheffield, Jr.

Executive Vice President, STAT, WAT and Corporate Engineering

In July 2015, Mr. Sheffield was appointed Executive Vice President, STAT, WAT and Corporate Engineering. He is responsible for Pioneer's South Texas operations, Western operations in the Rockies and West Panhandle, and Corporate Engineering activities. He has led South Texas operations since September 2014 and is also a Member of Pioneer’s Management Committee.

Prior to his current role, Sheffield served as Senior Vice President, Operations & Engineering to lead the Rockies, Mid-Continent and Barnett Shale Asset Teams, as well as Pioneer's corporate engineering and sustainable development efforts. Ken has also served as Vice President, Corporate Engineering.

Beginning in 2004, Sheffield served as President of Pioneer’s wholly owned Alaska subsidiary to establish and grow Pioneer’s operations in the state. In June 2008, production commenced from the Oooguruk oil field in the shallow waters of the Beaufort Sea, establishing Pioneer as the first independent operator in the history of Alaska’s North Slope.

Sheffield has served Pioneer in leadership positions since the company’s founding in 1997. He served as President and Vice President of Pioneer’s wholly owned Canadian subsidiary from 1999 to 2003. During 1997 and 1998, he served as Vice President & General Manager of the Gulf Coast Division in Houston. Earlier in his career with Mesa, a predecessor company to Pioneer, Ken served as Vice President, Acquisitions & Development during 1997 and Manager, Acquisitions & Engineering in 1996. Ken worked in a number of supervisory and technical positions from 1982 to 1996 with assignments in drilling, production, reservoir engineering and acquisitions.

Sheffield holds a Bachelor of Science degree in Petroleum Engineering from Texas A&M University and is a member of the Society of Petroleum Engineers.

Sheffield currently serves on the Texas A&M Petroleum Engineering Industry Board and the board of Bryan’s House, a non-profit organization in Dallas, Texas.

Denny B. Bullard »

Senior Vice President, Operations Services

Denny B. Bullard

Senior Vice President, Operations Services

Denny Bullard is Senior Vice President of Operations Services of Pioneer Natural Resources. Bullard has responsibility for the operations of Pioneer Pumping Services, the Company’s well stimulation fleet, and for Premier Silica, Pioneer’s industrial sand mining operations. In addition, Bullard is responsible for the Health, Safety, Environmental Services and Operations Training departments.

From December 2005 through October 2007, he served as Vice President of Engineering and Development and from October 2004 until November 2005 as Vice President of Gulf Coast Operations. From 1997 to 2004 he was the Operations Manager for Pioneer’s Gulf Coast Operations.

Between 1991 and 1997, Bullard was Operations Manager for three years and subsequently was Vice President for several Divisions at Parker & Parsley Petroleum Company, Pioneer’s predecessor.

Bullard previously worked for Damson Oil Corporation in Houston from 1984 to 1991 as a Production Manager. He began his career with Conoco, Inc. in 1970 before joining Damson. At Conoco he worked in various domestic and international locations in engineering and field supervisory positions.

Bullard received a Bachelor of Science degree in Petroleum Engineering from Texas Tech University. He serves on the Texas Tech University Industry Advisory Board for Petroleum Engineering and the Texas Tech University Dean’s Council. He is a member of the Society of Petroleum Engineers, American Society of Mechanical Engineers and the Society of Petrophysicists and Well Log Analysts. Bullard is a Registered Professional Engineer in Texas.

William F. Hannes »

Senior Vice President, Special Management Committee Advisor

William F. Hannes

Senior Vice President, Special Management Committee Advisor

In September 2014, Bill Hannes was appointed Senior Vice President, Special Management Committee Advisor. In this role, he will provide strategic advice to Pioneer’s Management Committee and oversee special projects. Prior to this position, he served as Executive Vice President of Southern Wolfcamp Operations for three years.

January 2010 through 2012 he was Executive Vice President, South Texas Operations. November 2005 through December 2009, he was Executive Vice President, Business Development. He was Vice President, Engineering & Development from June 2001 through October 2005 and General Manager, International Production from 1998 to 2001.

Hannes is an Officer of Pioneer Natural Resources and an advisory member of the Management Committee. He joined Pioneer in 1997 as Director of Business Development, and prior to Pioneer, he spent 16 years with Mobil and Superior Oil & Gas Co. in a variety of engineering and operations positions.

Hannes earned his Bachelor of Science in Petroleum Engineering from Texas A&M University.

Frank E. Hopkins »

Senior Vice President, Investor Relations

Frank E. Hopkins

Senior Vice President, Investor Relations

Frank Hopkins joined Pioneer Natural Resources in 2005 as Vice President, Investor Relations. He communicates Pioneer’s strategies, business plans and performance to the investment community.

Earlier in his career, Mr. Hopkins was with Exxon Mobil Corporation where he served as General Manager, Strategic Planning for the Global Services Company and previously as Deputy Manager, Investor Relations. With predecessor Mobil Corporation, he served in various capacities including Manager, Investor Relations and Assistant Controller.

He earned his Bachelor of Science in Business Administration from Penn State University and also participated in the executive education program at the Kellogg School of Management of Northwestern University.

Mr. Hopkins is a member of the National Investor Relations Institute and the Dallas Petroleum Club.

Mark H. Kleinman »

Senior Vice President, General Counsel and Assistant Secretary

Mark H. Kleinman

Senior Vice President, General Counsel and Assistant Secretary

Mark Kleinman joined Pioneer Natural Resources in June 2005 as Vice President, Corporate Secretary and Chief Compliance Officer. In January 2014, he was promoted to Senior Vice President and General Counsel, and was named an Advisory Member of the Management Committee.

As General Counsel and Assistant Secretary, Mr. Kleinman is responsible for all aspects of Pioneer’s Legal Department and supports Pioneer’s Board of Directors.

Mr. Kleinman began his career in 1986 as an associate with the Dallas-based law firm of Jackson Walker L.L.P. Most recently, he served as Vice President and General Counsel of Inet Technologies, Inc., a NASDAQ-traded global provider of communications software products, from 2000 through its acquisition in 2004 by Tektronics, Inc. Prior to that, he served as Assistant General Counsel of Sterling Software, Inc., a NYSE company supplying computer software and services worldwide, from 1996 through its acquisition in 2000 by Computer Associates International, Inc.

Mr. Kleinman received his Juris Doctor, with honors, from The University of Texas School of Law, where he served on the editorial board of The Texas Law Review. He graduated with a Bachelor of Arts in Government from The University of Texas.

He is a member of the State Bar of Texas, and he served on the New York Stock Exchange Commission on Corporate Governance, which issued its final report in 2010.

Larry N. Paulsen »

Senior Vice President, Administration and Risk Management

Larry N. Paulsen

Senior Vice President, Administration and Risk Management

In 1997, Larry Paulsen was appointed to Vice President of Administration and Risk Management for Pioneer Natural Resources. In January 2014, he was promoted to Senior Vice President, Administration and Risk Management and was named an Advisory Member of the Management Committee.

Mr. Paulsen is responsible for Human Resources, Risk Management, Corporate Facilities and Administrative Services. He provides leadership and accountability for these functions, and oversees risk assessment across all of Pioneer’s business units to ensure consistency and quality.

From 1991 to 1997, he served as Vice President of Administration and Risk Management for Parker & Parsley Petroleum Company, predecessor to Pioneer Natural Resources.

Prior to joining Pioneer, Mr. Paulsen served as Vice President for Alexander & Alexander Services, Inc. a risk management, insurance brokerage and human resources management consulting services company from 1978 to 1991.

Mr. Paulsen has a Bachelor of Science in Administrative Management from the University of Arkansas.

Todd C. Abbott »

Vice President, Finance and Treasurer

Todd C. Abbott

Vice President, Finance and Treasurer

Todd Abbott was appointed Vice President, Finance and Treasurer of Pioneer Natural Resources in September 2014. He is responsible for Treasury activities, including banking relationships, capital markets activities, cash management, credit policies and the Corporate Finance group. He is also involved with the Company’s risk management (insurance) decisions.

Abbott joined Pioneer in 2003 as Senior Analyst, Acquisitions and Divestitures, and then moved to Worldwide Operations. In 2005, he was promoted to Vice President, Corporate Finance. From 2011 to 2013, he served as President of Pioneer’s Alaska division. Abbott was Vice President, Permian Operations from 2013 to August 2014.

Prior to working for Pioneer, Abbott was a Financial Analyst with Citigroup and an Engineering Consultant with Halff Associates.

Abbott graduated from Texas A&M University with a Bachelor of Science in Civil Engineering before earning a Master of Business Administration from Southern Methodist University (SMU), Edwin L. Cox School of Business.

Abbott has served on the board of the Alaska Resource Development Council, and was active in the Alaska Oil & Gas Association. In 2013, he was honored as an Outstanding Young Alumnus of SMU.

John C. Distaso »

Vice President, Marketing

John C. Distaso

Vice President, Marketing

John Distaso joined Pioneer Natural Resources in June 2012 as Vice President of Marketing and is responsible for commercial sales of products (crude oil, condensate, NGL’s and natural gas) and downstream infrastructure planning to process, transport and fractionate products prior to final disposition.

Mr. Distaso has 30 years of industry experience. Prior to joining Pioneer, he held senior executive and managerial trading and marketing positions at Mobil Oil Corporation for 15 years and similar positions at Apache and Devon Energy. Mr. Distaso was most recently with Deloitte, working for the Minister of Petroleum in the Republic of South Sudan to market 300 MBOPD of crude, resulting in the country’s first $3 billion of oil revenues.

Mr. Distaso has experience in physical and paper trading, term and spot negotiations, cargo tanker shipping, transportation pipelines, processing facilities and storage operations. His experience encompasses all aspects of mid-stream and downstream marketing, and he has led multiple domestic and international Marketing departments.

Mr. Distaso received his Master of Business Administration from San Diego State University, a Bachelor of Science in Business from University of California Berkeley and a Bachelor of Arts in Philosophy from University of California San Diego.

Robert C. Hagens »

Vice President, Land and Regulatory Affairs

Robert C. Hagens

Vice President, Land and Regulatory Affairs

In August 2015, Bob Hagens assumed the role of Vice President, Land and Regulatory Affairs with Pioneer Natural Resources. He is responsible for managing the exploration, development, acquisition activities and regulatory affairs for Pioneer Natural Resources.

Hagens served as Vice President, Land with Pioneer Natural Resources from May 2008 to August 2015. From November 2005 until May 2008, he served as Vice President of Land, Pioneer Natural Resources USA subsidiary.

Prior to joining Pioneer, Hagens served as US Onshore Land & Regulatory Manager for BP America Production Company from March 2003 to October 2005. He also worked as a Portfolio Analyst and Senior Advisor from October 2000 to February 2003.

Earlier in his career, he worked with Vastar Resources, Inc. as US Gulf Coast Land Manager from September 1997 to September 2000. From 1983 to 2000, he held various positions with Atlantic Richfield Company and Vastar.

Hagens has a Bachelor of Business Administration (PLM) from the University of Texas at Austin. Hagens is a member of and certified by the American Association of Professional Landmen.

Paul McDonald »

Vice President, Vertically Integrated Services

Paul McDonald

Vice President, Vertically Integrated Services

Biography coming soon

Margaret M. Montemayor »

Vice President and Chief Accounting Officer

Margaret M. Montemayor

Vice President and Chief Accounting Officer

Ms. Montemayor was elected the Company’s Vice President and Chief Accounting Officer effective March 2014. Ms. Montemayor had previously served the Company as Vice President and Corporate Controller since January 2014, Corporate Controller from April 2012 to December 2013, and Director of Technical Accounting and Financial Reporting from June 2010 to March 2012. Prior to joining the Company, Ms. Montemayor served as Manager at PricewaterhouseCoopers LLP since June 2006. Ms. Montemayor graduated from St. Mary’s University in San Antonio, Texas with a Bachelor of Business Administration degree in Accounting and a Master of Business Administration.

Thomas D. Sheffield »

Vice President, Health, Safety and Environment

Thomas D. Sheffield

Vice President, Health, Safety and Environment

Mr. Sheffield assumed the role of Vice President, Health, Safety and Environmental in July 2015. Prior to his current role, he served as Vice President, Western Asset Team since September 2014. His responsibilities included managing drilling, operations and influencing business development activities for the Rockies region.

In January 2008, he became the Vice President, Rockies Asset Team. From September 2004 until January 2008, Sheffield served as the asset manager for the Raton Basin where he was responsible for the planning, budgeting, execution, tracking and delivering year on year goals. Prior to this assignment Sheffield was part of the business development team in Las Colinas as a senior staff geologist where he was involved in various acquisition targets and evaluations including the Evergreen merger. Previous to the business development role, Sheffield worked in various basins throughout North America as both an exploitation and exploration geologist. Earlier in his career, Sheffield worked with the Reservoir Engineering Group for initial training prior to transferring to the Geological group.

From July 1988 until 1992, he served as Lease Operator and Relief Foreman at Parker & Parsley, Pioneer’s predecessor.

Earlier in his career, Sheffield worked for FWA (Texas Oil & Gas, subsidiary), drilling contractor from July 1983 to July 1988.

Tom is a graduate of the University of Texas, Permian Basin, where he earned both a Bachelor of Science and a Master of Science in Geological Science.

Tom is a board member with WEA and COGA (serving as Chairman for both), a member of the AAPG & RMAG, and is active in supporting various local charities.

Tom D. Spalding »

Vice President, Geoscience

Tom D. Spalding

Vice President, Geoscience

Mr. Spalding serves as Vice President, Geoscience, providing oversight for geoscience across Pioneer and managing subsurface geoscience and reservoir engineering integration. Prior to his current role, he served as Vice President, Permian Subsurface from September 2014 to July 2015.

Spalding has served Pioneer in various positions since 1997, including Vice President Technology in 2010, Vice President North America Exploration in 2004 and Offshore Exploration Manager in 1998.

Earlier in his career, Spalding spent 16 years with Mobil working as an exploration and production geoscientist for domestic divisions in Dallas, Houston and New Orleans. He completed his Mobil career working in their international division with emphasis on West Africa exploration. He has a Master of Science degree and a Bachelor of Science degree in Geology from the University of Kentucky.

He has been a member of the American Association of Petroleum Geologists since 1981, and current or past member of the Dallas Geological Society, Houston Geological Society, and New Orleans Geological Society. Spalding is licensed as a Professional Geoscientist in the state of Texas.

Susan A. Spratlen »

Vice President, Permian Affairs

Susan A. Spratlen

Vice President, Permian Affairs

Susan Spratlen has served as a Vice President of Pioneer Natural Resources since 1999, having joined the company’s predecessor, Parker & Parsley Petroleum Company, in 1990 as Director of Investor Relations. In 1999, she was named Vice President, Corporate Communications and Investor Relations. Beginning in 2005, she served as Vice President of Communications and Public Affairs, and in 2011, her responsibilities were expanded to include Sustainability.

Ms. Spratlen is responsible for Pioneer’s national, state and local Communication and Public Relations strategies, including internal and external communications, media relations, public engagement, advertising, employee volunteer programs and corporate philanthropy. She also coordinates with the Sustainable Development and other departments to develop and execute strategies related to Sustainability and public engagement regarding sustainable oil and natural gas development practices.

She serves and advises a number of national and state industry organizations and initiatives focused on education and public engagement regarding sustainable development practices and the industry’s societal impacts. These initiatives also promote the benefits of expanded use of domestic natural gas for power generation and transportation. She serves on national committees with America’s Natural Gas Alliance and chairs that organization’s public engagement committee for the state of Texas. The Texas Natural Gas Now campaign is a major project of the Texas public engagement committee of ANGA.

Ms. Spratlen is also promoting collaborative industry communications initiatives in the Permian Basin and Eagle Ford Shale, Pioneer’s primary operating areas. She is on the steering committee and governing board for a new organization in Texas representing an alliance of energy consumers, producers, services and communities.

Ms. Spratlen is a Certified Public Accountant, and prior to joining the Company, she worked for KPMG. She graduated Summa Cum Laude from Angelo State University and holds a BBA degree in Accounting.
Stephanie D. Stewart »

Vice President and Chief Information Officer

Stephanie D. Stewart

Vice President and Chief Information Officer

Stephanie Stewart joined Pioneer Natural Resources in June 2014 as Vice President and Chief Information Officer. Ms. Stewart has more than 20 years of information technology experience in the energy industry. Before joining Pioneer, she served as Vice President of E&P Data and Analytics and Strategic Integration at Devon Energy at the end of her 12-year tenure there. Prior to Devon, she worked at Williams Energy for four years and BP Amoco for three years.

In her current role, Ms. Stewart is responsible for the Information Technology (IT) organization, ensuring IT alignment with the business strategy and for providing innovative technical solutions. She is also an Advisory Member of Pioneer’s Management Committee.

Ms. Stewart earned a Bachelor of Business Administration from the University of Oklahoma and has her Executive MBA in Energy from the University of Oklahoma’s Price College of Business.

She participated as an Executive Board Member for the Lyric Theatre of Oklahoma and is a Board Member for the University of Oklahoma Tip-In Club. Ms. Stewart was also a member of the Passion Team for the American Heart Association Go Red for Women.

Roger W. Wallace »

Vice President, Federal Policy

Roger W. Wallace

Vice President, Federal Policy

Roger Wallace was appointed Vice President, Federal Policy in January 2014. He previously served as Vice President, Government Affairs from February 2005 to December 2013.

Prior to joining Pioneer, Mr. Wallace served as President and CEO of Investamex, an investment and consulting firm he co-founded in 1993.

From 1991 until 1993, Mr. Wallace was the Minister Counselor for Commercial Affairs at the United States Embassy in Mexico City during the negotiations of the North American Free Trade Agreement. He was the principal U.S. government representative in Mexico responsible for bilateral trade and investment activities.

From 1989 to August 1991, he served as the Deputy Under Secretary for International Trade at the U.S. Department of Commerce, managing the day-to-day activities of the International Trade Administration. As Deputy Under Secretary, he was responsible for coordinating the Commerce Department's role during the preparatory phases of the North American Free Trade negotiations, for which he received the Department’s highest award.

Mr. Wallace graduated with a Bachelor of Arts degree from Washington and Lee University. He received a Master of Arts degree from the Fletcher School of Law and Diplomacy with post-graduate work at the Graduate Institute of International Studies in Geneva, Switzerland.

He currently serves as Co-Chair of the Woodrow Wilson Center’s Mexico Institute Advisory Board. He completed a term as Chairman of the Inter-American Foundation and continues as a member of the board. He is on the board of the Asia Society Texas Center where he was Founding Chairman and is a member of the board of the US-Mexico Foundation. He was a Trustee of the Salzburg Seminar in American Studies, now the Salzburg Global Seminar. He is a member of the Council on Foreign Relations.

Board Of Directors

Scott D. Sheffield »

Chairman and Chief Executive Officer

Scott D. Sheffield

Chairman and Chief Executive Officer

Scott Sheffield has held the position of Chief Executive Officer for the Company since August 1997 and assumed the position of Chairman of the Board of Directors for the Company in August 1999. He was President of the Company from August 1997 to November 2004. Mr. Sheffield is a distinguished graduate of The University of Texas with a Bachelor of Science degree in Petroleum Engineering. He was the Chairman of the Board of Directors and Chief Executive Officer of Parker & Parsley, a predecessor of the Company, from January 1989 until the Company was formed in August 1997. Mr. Sheffield joined Parker & Parsley as a petroleum engineer in 1979, was promoted to Vice President - Engineering in September 1981, was elected President and a Director in April 1985, and became Parker & Parsley’s Chairman of the Board and Chief Executive Officer in January 1989. Before joining Parker & Parsley, Mr. Sheffield was employed as a production and reservoir engineer for Amoco Production Company. Mr. Sheffield also serves as a director of Santos Limited, an Australian exploration and production company.

Edison C. Buchanan - 3, 4, 5 »

Former Managing Director, Credit Suisse First Boston

Edison C. Buchanan

Former Managing Director, Credit Suisse First Boston

Edison Buchanan became a Director of the Company in 2002. Mr. Buchanan received a Bachelor of Science degree in Civil Engineering from Tulane University in 1977 and a Master of Business Administration in Finance and International Business from Columbia University Graduate School of Business in 1981. From 1981 to 1997, Mr. Buchanan was a Managing Director of various groups in the Investment Banking Division of Dean Witter Reynolds in their New York and Dallas offices. In 1997, Mr. Buchanan joined Morgan Stanley Dean Witter as a Managing Director in the Real Estate Investment Banking group. During 2000, Mr. Buchanan served as Managing Director and head of the domestic Real Estate Investment Banking Group of Credit Suisse First Boston. Mr. Buchanan also served on the Board of Directors of MFA Financial, Inc. from March 2004 through May 2011.

Andrew F. Cates - 3, 4 »

Managing Member, Value Acquisition Fund

Andrew F. Cates

Managing Member, Value Acquisition Fund

Andrew Cates became a Director of the Company in June 2009. Mr. Cates earned a Bachelor of Business Administration in Finance at the University of Texas at Austin. He is the Managing Member of Value Acquisition Fund and Chief Executive Officer of RVC Outdoor Destinations, a developer and operator of outdoor resorts. Mr. Cates has acquired and asset managed commercial real estate throughout the United States within various entities, including Value Acquisition Fund, an acquisition, development, and asset management company that he founded in 2004. After starting his career in Dallas, Texas with Crow Family Holdings and Viceroy Investments, he became the Project Developer and founding Board Chairman of Soulsville, one of the largest inner city revitalization projects in the United States. In 2000, he began working with a team of civic and business leaders that attracted the Vancouver Grizzlies NBA franchise to Memphis, Tennessee in 2001. Mr. Cates serves on the boards of The Soulsville Foundation and Myelin Repair Foundation.

Timothy L. Dove »

President and Chief Operating Officer

Timothy L. Dove

President, Chief Operating Officer and Board Member

Tim Dove became a Director of the Company in May 2013 and has served as the Company’s President and Chief Operating Officer since December 2004. He held the positions for the Company of Executive Vice President and Chief Financial Officer from February 2000 to November 2004 and Executive Vice President - Business Development from August 1997 to January 2000. Mr. Dove earned a Bachelor of Science degree in Mechanical Engineering from Massachusetts Institute of Technology in 1979 and received his Master of Business Administration in 1981 from the University of Chicago. Mr. Dove joined Parker & Parsley, a predecessor of the Company, in 1994 as Vice President and was promoted to Senior Vice President - Business Development in October 1996, in which position he served until the Company’s formation in August 1997. Before joining Parker & Parsley, Mr. Dove was employed with Diamond Shamrock Corp and its successor, Maxus Energy Corp., in various capacities in international exploration and production, marketing, refining, and planning and development.

Phillip A. Gobe - 3, 4, 5 »

Former President and Chief Operating Officer, Energy Partners, Ltd.

Phillip A. Gobe

Former President and Chief Operating Officer, Energy Partners, Ltd.

Phillip Gobe joined Energy Partners, Ltd. as Chief Operating Officer in December 2004 and became President in May 2005, and served in those capacities until his retirement in September 2007. Mr. Gobe also served as a director of Energy Partners, Ltd. from November 2005 until May 2008. Prior to that, Mr. Gobe served as Chief Operating Officer of Nuevo Energy Company from February 2001 until its acquisition by Plains Exploration & Production Company in May 2004. Prior to that time, he held numerous operations and human resources positions with Vastar Resources, Inc. and Atlantic Richfield Company and its subsidiaries. Mr. Gobe served as a director of the general partner of Pioneer Southwest Energy Partners L.P. from April 2008 until its merger with Pioneer Natural Resources Company in December 2013. He is also a director and Chairman of the Compensation Committee of Scientific Drilling International, Inc. Mr. Gobe is a graduate of the University of Texas with a degree in history and earned his MBA at the University of Louisiana in Lafayette.

Larry R. Grillot - 2, 4 »

Dean, Mewbourne College of Earth and Energy, The University of Oklahoma

Larry R. Grillot

Dean, Mewbourne College of Earth and Energy
The University of Oklahoma

Larry Grillot became a Director of the Company in July 2013. Dr. Grillot graduated from Mississippi State University with a Bachelor of Science degree in Physics and then earned master’s and doctoral degrees in geological sciences from Brown University. Dr. Grillot is dean of the Mewbourne College of Earth and Energy at the University of Oklahoma, a position he has held since 2006. He also is a member of the American Association of Petroleum Geologists, the Society of Exploration Geophysicists and the Society of Petroleum Engineers. Prior to his role at the University of Oklahoma, from 1973 until his retirement in 2003, Dr. Grillot worked for Phillips Petroleum Company in a variety of technical and managerial positions in exploration and production, including Manager of E&P Technology and Services, Upstream Technology and Project Development, Manager of International Exploration, President and Region Manager for Phillips Petroleum Canada Limited and Manager of E&P Planning.

Stacy P. Methvin - 3, 4, 5 »

Retired Vice President, Shell Oil Company

Stacy P. Methvin

Retired Vice President, Shell Oil Company

Stacy Methvin became a Director of the Company in July 2013. Ms. Methvin graduated from Princeton University with a Bachelor of Arts degree in Geological and Geophysical Sciences. From 2011 until her retirement in 2012, Ms. Methvin was Vice President, Refining Margin Optimization of Shell Oil Company (“Shell”), and from 2009 until 2010, she was Vice President, Global Distribution of Shell. Ms. Methvin also held various other operational and management roles in the upstream, downstream and chemical businesses during her tenure at Shell and its subsidiaries that began in 1979, including President, Shell Louisiana E&P Company, President, Shell Deer Park Refining Company, President Shell Pipeline Company LP, President, Shell Chemical LP, Vice President, Strategy and Portfolio for the downstream business. She also serves on the board of the Houston Zoo and is a member of the finance committee of the Board of Memorial Hermann Hospital System, the Chair of the San Jacinto Girl Scout Council and a trustee for the Springside Chestnut Hill Academy in Philadelphia. She has been an appointee on the Louisiana Governor’s Commission for Coastal Restoration and Protection since 2003.

Royce W. Mitchell

Executive Consultant

Royce Mitchell has been an executive consultant, focusing on advising management and audit committees of exploration and production companies, since January 2005, except for the period from April 2008 through December 2008 when he served as Chief Financial Officer of Frac Tech Services, Ltd. Mr. Mitchell served as Executive Vice President, Chief Financial Officer and Chief Accounting Officer of Key Energy Services, Inc. from January 2002 to January 2005. Before joining Key Energy Services, Inc., he was a partner with KPMG LLP from April 1986 through December 2001 specializing in the oil and gas industry. Mr. Mitchell served as a director and audit committee chairman of the general partner of Pioneer Southwest Energy Partners L.P. from April 2008 until its merger with Pioneer Natural Resources Company in December 2013. He received a BBA from Texas Tech University and is a certified public accountant.

Frank A. Risch - 2, 4, 5 »

Retired Vice President and Treasurer, Exxon Mobil Corporation

Frank A. Risch

Retired Vice President and Treasurer, Exxon Mobil Corporation

Frank Risch became a director of the Company in August 2005. Mr. Risch holds a Bachelor of Science degree in Business Administration from Pennsylvania State University and a Master of Science degree in Industrial Administration from Carnegie Mellon University. Mr. Risch joined Exxon Corporation in 1966 as a financial analyst in New York and subsequently held various positions in finance, planning, marketing and general management with Exxon and its operating affiliates in the U.S. and abroad for nearly 38 years. Mr. Risch retired in July 2004 as Vice President and Treasurer (and principal financial officer) of Exxon Mobil Corporation. Mr. Risch currently serves on the Board of Directors of the general partner of Susser Petroleum Partners LP, a master limited partnership engaged primarily in the wholesale motor fuel distribution business, and is a member of the Business Board of Advisors of the Tepper School of Business at Carnegie Mellon University. He is active in civic and community organizations, serving as Immediate Past Chairman and Life Trustee of the Board of the Dallas Theater Center; Chairman of the Board of Communities Foundation of Texas; and member of the Boards of the ATT Performing Arts Center, Dallas CASA (Court Appointed Special Advocates) and the Dallas Holocaust Museum. He is a member of Financial Executives International.

Mona K. Sutphen - 5 »

Partner, Macro Advisory Partners LLP

Mona K. Sutphen

Partner, Macro Advisory Partners LLP

Mona Sutphen was named a Director of the Company in 2015. Ms. Sutphen is a Partner at Macro Advisory Partners LLP, and previously spent three years at UBS AG as Managing Director, covering geopolitical risk and macro-policy trends. From 2009 through 2011, she served as White House Deputy Chief of Staff for Policy for President Obama, working on a range of domestic and international policy and regulatory matters. Prior to that position, she was Managing Director at Stonebridge International, and from 1991 through 2000 was a career diplomat, serving on the staff of the National Security Council, the U.S. Mission to the UN and postings in Asia and Europe.

Ms. Sutphen is a Member of the President’s Intelligence Advisory Board. She serves on the Boards of Drilling Info Holdings LLC, the International Rescue Committee and Human Rights First. Ms. Sutphen is a member of the Council on Foreign Relations, a Trustee of Mount Holyoke College and is on the Advisory Board of the Center for Global Energy Policy at Columbia University. She is co-author of The Next American Century: How the US Can Thrive As Other Powers Rise, and holds a BA degree from Mount Holyoke College and an MSc degree from the London School of Economics.

J. Kenneth Thompson - 1, 3, 4, 5 »

President and CEO, Pacific Star Energy LLC

J. Kenneth Thompson

President and CEO, Pacific Star Energy LLC

J. Kenneth Thompson became a Director of the Company in August 2011. He received a Bachelor of Science degree in Petroleum Engineering from Missouri University of Science & Technology. He has served as the President and Chief Executive Officer of Pacific Star Energy LLC, a privately held oil and gas investment firm in Alaska, since September 2000, and as Managing Director of Alaska Venture Capital Group LLC, a privately held oil and gas exploration company in which Pacific Star Energy LLC owns an interest, from December 2004 to December 2012. Mr. Thompson’s experience includes serving as Executive Vice President of Atlantic Richfield Company’s (“ARCO”) Asia Pacific oil and gas operating companies in Alaska, California, Indonesia, China and Singapore from 1998 to 2000, and President and Chief Executive Officer of ARCO Alaska, Inc., the parent company’s oil and gas producing division based in Anchorage, from June 1994 to January 1998. He also served as executive head of ARCO’s oil and gas research and technology center from 1993 to 1994. Mr. Thompson also serves as a director of Coeur d'Alene Mines Corporation, a company engaged in the operation, ownership, development and exploration of silver and gold mining property, Alaska Air Group, Inc., a holding company for Alaska Airlines and Horizon Air Industries, and Tetra Tech, Inc., an engineering consulting firm.

Phoebe A. Wood - 2, 4 »

Retired Vice Chairman and Chief Financial Officer, Brown-Forman Corporation

Phoebe A. Wood

Retired Vice Chairman and Chief Financial Officer, Brown-Forman Corporation

Phoebe Wood became a Director of the Company in July 2013. Ms. Wood graduated from Smith College with an A.B. degree in Psychology and then earned a Master of Business Administration from the University of California Los Angeles. Since 2008, Ms. Wood has been a principal at CompaniesWood, a consulting firm specializing in early stage investments. She was Executive Vice President and Chief Financial Officer of Brown-Forman Corporation, a diversified consumer products manufacturer, from 2001 to 2006, and Vice Chairman and Chief Financial Officer from 2006 to 2008. Prior to Brown-Forman Corporation, Ms. Wood was Vice President, Chief Financial Officer and a Director of Propel Corporation (a subsidiary of Motorola) from 2000 to 2001. Previously, Ms. Wood served in various capacities during her tenure at ARCO from 1976 to 2000. Ms. Wood currently serves on the Boards of Directors of Coca-Cola Enterprises Inc., a major bottler and distributor of Coca-Cola products, Invesco Ltd., a global investment management company, and Leggett & Platt, Incorporated, a diversified manufacturer, as well as on the boards of trustees for the University of Louisville, the Gheens Foundation and the American Printing House for the Blind.

Michael D. Wortley - 2, 4 »

Chief Legal Officer, Reata Pharmaceuticals, Inc.

Michael D. Wortley

Chief Legal Officer, Reata Pharmaceuticals, Inc.

Michael Wortley was named a Director of the Company in 2015. Mr. Wortley has practiced corporate law for over 35 years, focusing primarily on corporate governance matters and mergers and acquisitions, including over 25 years in management positions. He has represented public and private entities and private equity funds in connection with mergers, asset sales, issuances of securities and restructurings.

Mr. Wortley was a partner in the Dallas, Texas, office of Vinson & Elkins LLP from 1995 to 2014 and served in various capacities, including Chief Operating Partner of the firm and Managing Partner of the Dallas office. Prior to joining Vinson & Elkins, he was an attorney with Johnson & Wortley, P.C. (which prior to 1993 was known as Johnson & Swanson or Johnson & Gibbs) from 1978 to 1995 and served in various capacities, including President and Chairman of the Board. Mr. Wortley has also served on both for-profit public company boards and non-profit boards of trustees. He holds BA and JD degrees from Southern Methodist University and a Master’s degree in Regional Planning from the University of North Carolina at Chapel Hill. He is currently the Chief Legal Officer for Reata Pharmaceuticals, Inc.

COMMITTEE MEMBERSHIP

1 Lead Director
2 Audit Committee
3 Compensation and Management Development
   Committee
4 Nominating and Corporate Governance Committee
5 Health, Safety and Environment Committee