Directors

Our Board of Directors

James Hackett
Executive Chairman of the Board and Chief Operating Officer - Midstream

Mr. Hackett is a partner at Riverstone. Prior to joining Riverstone in 2013, Mr. Hackett served as the Chairman of the Board from 2006 to 2013 and the Chief Executive Officer from 2003 to 2012 of Anadarko Petroleum Corporation. Before joining Anadarko, Mr. Hackett served as President and Chief Operating Officer of Devon Energy Corporation, following its merger with Ocean Energy, where he had served as Chairman, President, and Chief Executive Officer. Mr. Hackett has held senior positions at Seagull, Duke Energy, and Pan Energy. He also held positions in engineering, finance and marketing in the midstream, oil field services, and power sectors of the energy industry. Mr. Hackett serves on the Board of Directors of Enterprise Products Holdings, LLC, Fluor Corporation (NYSE: FLR), National Oilwell Varco, Inc. (NYSE: NOV), Sierra Oil and Gas and Talen Energy Corporation and Crimson Resources. Mr. Hackett is a former Chairman of the Board of the Federal Reserve Bank of Dallas. Mr. Hackett received a Bachelor of Science degree from the University of Illinois in 1975 and an MBA and MTS from Harvard Business School in 1979 and 2016, respectively. Mr. Hackett was selected to serve on the board of directors due to his significant leadership experience and his extensive experience in the energy industry.

Michael E. Ellis
Director and Chief Operating Officer—Upstream

Mr. Ellis founded Alta Mesa in 1987 after beginning his career with Amoco and previously served as Alta Mesa’s Chairman and Chief Operating Officer, as well as Vice President of Engineering. Mr. Ellis managed all day-to-day engineering and field operations of Alta Mesa. He built Alta Mesa’s asset base by starting with small earn-in exploitation projects, then progressively grew Alta Mesa with successive acquisitions of fields from major oil companies and consistent success in exploration and development drilling. He has over 30 years’ experience in management, engineering, exploration and acquisitions and divestitures. Mr. Ellis holds a Bachelor of Science in Civil Engineering from West Virginia University. Because of his broad knowledge of, and experience with, oil and gas exploration and production, we believe Mr. Ellis is well qualified to serve on our board of directors.

Pierre F. Lapeyre Jr.
Director

Mr. Lapeyre is a Founder of Riverstone and has been a Senior Managing Director since 2000. Prior to founding Riverstone, Mr. Lapeyre was a Managing Director of Goldman Sachs in its Global Energy and Power Group. Mr. Lapeyre joined Goldman Sachs in 1986 and spent his 14-year investment banking career focused on energy and power, particularly the midstream, upstream and energy service sectors. Mr. Lapeyre serves as a non-executive board member of Riverstone Energy Limited (LSE: REL) since May 2013, a non-executive board member of Centennial Resource Development, Inc. since October 2016 and serves on the boards of directors or equivalent bodies of a number of private Riverstone portfolio companies and their affiliates. He has an MBA from the University of North Carolina at Chapel Hill and a B.S. in Finance and Economics from the University of Kentucky. Mr. Lapeyre was selected to serve on the board of directors due to his extensive mergers and acquisitions, financing and investing experience in the energy and power industry.

Don Dimitrievich
Director

Mr. Dimitrievich is a Managing Director at HPS and is responsible for the energy and power portfolio. Prior to joining HPS in 2012, Mr. Dimitrievich was a Managing Director of Citi Credit Opportunities, a credit-focused principal investment group. At Citi Credit Opportunities, Mr. Dimitrievich oversaw the energy and power portfolio and invested in mezzanine, special situation and equity co-investments, and secondary market opportunities. Prior to joining Citi, Mr. Dimitrievich worked in the New York office of Skadden, Arps, Slate, Meagher & Flom LLP from 1998 to 2004 focusing on energy M&A and capital markets transactions. Mr. Dimitrievich has a law degree magna cum laude from McGill University in Montreal, Canada and earned a chemical engineering degree with Great Distinction from Queen’s University in Kingston, Canada. Mr. Dimitrievich currently serves on the following Boards: Alta Mesa Holdings LP, Blue Ridge Mountain Resources, Inc., Expro International Group Holdings Ltd., Glacier Oil & Gas Corp., Kingfisher Midstream, LLC, Marquis Resources, LLC and Upstream Exploration LLC. Mr. Dimitrievich was selected to serve on the board of directors due to his significant mergers and acquisitions, financing and investing experience in the energy and power industry.

Jeffrey H. Tepper
Director

Mr. Tepper is a Founder of JHT Advisors LLC, a mergers and acquisitions advisory and investment firm. From 1990 to 2013, Mr. Tepper served in a variety of senior management and operating roles at the investment bank Gleacher & Company, Inc. and its predecessors and affiliates (“Gleacher”). Mr. Tepper is experienced in mergers and acquisitions, corporate finance, leveraged finance and asset management. Mr. Tepper was Head of Investment Banking and a member of the Management Committee while at Gleacher. Mr. Tepper led numerous investment banking transactions on behalf of clients in a variety of industries but with a specialty in financial services and asset management. Mr. Tepper also served as Gleacher’s Chief Operating Officer, overseeing operations, compliance, technology and financial reporting. In 2001, Mr. Tepper co-founded Gleacher’s asset management activities and served as President. Mr. Tepper served on the Investment Committees of Gleacher Mezzanine and Gleacher Fund Advisors. Between 1997 and 1999, Mr. Tepper served as Managing Director of and Chief Operating Officer of Gleacher NatWest Inc. (a predecessor to Gleacher Partners). Mr. Tepper was part of the senior management team of Gleacher NatWest with oversight responsibility for middle-market senior and subordinated debt, high-yield and equity principal activities. Between 1987 and 1990, Mr. Tepper was employed by Morgan Stanley & Co. as a financial analyst in the mergers and acquisitions and merchant banking departments. Mr. Tepper also served as a director of Silver Run Acquisition Corporation (NASDAQ: SRAQ) from its inception in November 2015 until the completion of its acquisition of Centennial Resource Production, LLC in October 2016 and has served as a director of Centennial Resource Development, Inc. (NASDAQ: CDEV) since October 2016. Mr. Tepper received an MBA from Columbia Business School and a B.S. in Economics from The Wharton School of the University of Pennsylvania with concentrations in finance and accounting. Mr. Tepper was selected to serve on the board of directors due to his significant investment and financial experience.

Donald R. Sinclair
Director

Mr. Sinclair has over 30 years of experience in the oil and gas industry, with a focus on marketing and trading, particularly in the midstream sector. Mr. Sinclair currently serves as the Chairman of the Board of Directors and President of WTX Pumping Services LLC. He also currently serves as a senior advisor to Anadarko Petroleum Corporation and as a senior advisor to Western Gas Equity Holdings, LLC (“WES GP”), the general partner of Western Gas Equity Partners LP. From 2009 to 2017, Mr. Sinclair served as the President and Chief Executive Officer of WES GP and as a member of the board of directors of WES GP. From 2010 to 2016, he also served as the Vice President and Senior Vice President of Anadarko Petroleum Corporation. In 2003, Mr. Sinclair co-founded Ceritas Energy, LLC (“Ceritas”), and served as the President and Chief Executive Officer of Ceritas from 2003 to 2009. From 1998 to 2003, Mr. Sinclair was involved in energy industry consulting and the management of personal business interests. From 1997 to 1998, he served as the President of Duke Energy Trading and Marketing LLC (“Duke”). Prior to joining Duke, Mr. Sinclair served as Senior Vice President of Tenneco Energy, a unit of Tenneco Inc. (“Tenneco”), and as President of Tenneco Energy Resources Corporation. Prior to joining Tenneco, Mr. Sinclair also served for eight years in various officer positions with Dynegy Inc. (formerly NGC Corporation), including as Senior Vice President and Chief Risk Officer, during which time he was in charge of all risk management activities and commercial operations. Mr. Sinclair earned a Bachelor of Business Administration degree from Texas Tech University. Mr. Sinclair was selected to serve on the board of directors due to his significant leadership experience and his extensive investment experience in the oil and gas industry.

Hal Chappelle
Director and Chief Executive Officer

Mr. Chappelle previously served as the President, CEO and director of Alta Mesa since November 2004. Mr. Chappelle has over 30 years of experience in field operations, engineering, management, marketing and trading, acquisitions and divestitures and field re-development. He has worked for Louisiana Land & Exploration Company, Burlington Resources, Southern Company and Mirant. Mr. Chappelle retired as a Commander from the U.S. Navy Reserve. He has a Bachelor of Chemical Engineering from Auburn University and a Master of Science in Petroleum Engineering from The University of Texas at Austin. Mr. Chappelle’s experience as Alta Mesa’s Chief Executive Officer since 2004 and over 30 years of experience in the oil and gas industry uniquely qualify him to serve on our board of directors.

David M. Leuschen
Director

Mr. Leuschen is a Founder of Riverstone and has been a Senior Managing Director since 2000. Prior to founding Riverstone, Mr. Leuschen was a Partner and Managing Director at Goldman Sachs and founder and head of the Goldman Sachs Global Energy and Power Group. Mr. Leuschen joined Goldman Sachs in 1977, became head of the Global Energy and Power Group in 1985, became a Partner of that firm in 1986 and remained with Goldman Sachs until leaving to found Riverstone in 2000. Mr. Leuschen also served as Chairman of the Goldman Sachs Energy Investment Committee, where he was responsible for screening potential capital commitments by Goldman Sachs in the energy and power industry and was responsible for establishing and managing the firm’s relationships with senior executives from leading companies in all segments of the energy and power industry. Mr. Leuschen serves as a non-executive board member of Riverstone Energy Limited (LSE: REL) since May 2013, a non-executive board member of Centennial Resource Development, Inc. since October 2016 and serves on the boards of directors or equivalent bodies of a number of private Riverstone portfolio companies and their affiliates. Mr. Leuschen has received an MBA from Dartmouth’s Amos Tuck School of Business and an A.B. degree from Dartmouth College. Mr. Leuschen was selected to serve on the board of directors due to his extensive mergers and acquisitions, financing and investing experience in the energy and power industry.

William W. McMullen
Director

Mr. McMullen is the founder and managing partner of Bayou City Energy (“BCE”), an oil and gas focused private equity firm based in Houston, Texas. Mr. McMullen founded BCE in 2015 after successfully managing a smaller private equity vehicle, Bayou City Energy Partners (“BCEP”), focused on investments in the oil and gas sector. Prior to BCEP, Mr. McMullen served as Vice President at White Deer Energy, an oil and gas focused private equity firm. Before White Deer Energy, Mr. McMullen served as an Associate at Denham Capital. Prior to Denham Capital, Mr. McMullen served as an Analyst in UBS Investment Bank’s Global Energy group. Mr. McMullen earned his Bachelor’s degree in Economics, with Honors, from Harvard University. Because of his broad knowledge of, and experience with, oil and gas investments, we believe Mr. McMullen is well qualified to serve on our board of directors.

William D. Gutermuth
Director

Mr. Gutermuth is the Founder and Chairman of Bluegrass Capital LLC, a privately owned investment and consulting firm. Since January 1, 2015, he has devoted substantially all of his professional time and energies to Bluegrass Capital. Prior to that, Mr. Gutermuth was an equity partner at Bracewell & Giuliani LLP and its predecessor firm, Bracewell & Patterson, LLP, where he practiced corporate and transactional law for almost 35 years. Mr. Gutermuth’s legal career focused principally on mergers and acquisitions, particularly in the energy industry, as well as most aspects of corporate finance and corporate governance. Mr. Gutermuth chaired Bracewell & Giuliani’s worldwide Corporate and Securities Practice from 1999 to 2005 and served as a member of the Business Group Executive Committee from 2005 to 2007, as well as serving in other leadership positions within the law firm throughout his career. Mr. Gutermuth served as a director of Main Street Capital Corporation (NYSE: MAIN), a publicly traded business development company, from 2007 to 2012 and on the Compensation and Nominating and Governance Committees during his tenure as a director. Mr. Gutermuth also served as a director of Silver Run Acquisition Corporation (NASDAQ: SRAQ) from its inception in November 2015 until the completion of its acquisition of Centennial Resource Production, LLC in October 2016. Mr. Gutermuth holds a B.S. in Political Science from Vanderbilt University and a J.D. from Vanderbilt University School of Law. Mr. Gutermuth was selected to serve on the board of directors due to his significant leadership experience and his extensive merger and acquisition experience.

Diana J. Walters
Director

Ms. Walters has 30 years of experience in the natural resources sector, as an investment manager and equity investor, as an investment banker and in operating roles. Ms. Walters has been the owner and sole manager of 575 Grant, LLC, a company that provides advisory services in the field of natural resources, since 2014. She served as the President and Chief Executive Officer of Liberty Metals & Mining Holdings, LLC and a member of senior management of Liberty Mutual Asset Management from January 2010 to September 2014. She was a Managing Partner of Eland Capital, LLC, a natural resources advisory firm founded by her, from 2007 to 2010. Ms. Walters has extensive investment experience with both debt and equity through various previous leadership roles at Credit Suisse, HSBC and other firms. She also served previously as Chief Financial Officer of Tatham Offshore Inc., an independent oil and gas company with assets in the Gulf of Mexico. Ms. Walters also served as a director of Silver Run Acquisition Corporation (NASDAQ: SRAQ) from its inception in November 2015 until the completion of its acquisition of Centennial Resource Production, LLC in October 2016. Ms. Walters currently serves on the board of directors of Platinum Group Metals (NYSE: PLG) and Electrum Special Acquisition Corporation (NASDAQ: ELECU). Ms. Walters graduated with Honors from the University of Texas at Austin with a B.A. in Plan II Liberal Arts and an M.A. in Energy and Mineral Resources. Ms. Walters was selected to serve on the board of directors due to her significant investment and operating experience in the energy industry.