Directors

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. 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. 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. 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.

Sylvia J. Kerrigan has over 25 years of experience in the energy sector. Ms. Kerrigan most recently was the Executive Vice President, General Counsel and Secretary of Marathon Oil Corporation, serving in that position from 2012 to 2017. Ms. Kerrigan also served as Marathon Oil Corporation’s Chief Public Policy Officer and Chief Compliance Officer. Prior to her appointment as Executive Vice President, Ms. Kerrigan served as Marathon Oil Corporation’s Vice President, General Counsel and Secretary since 2009. Previously, Ms. Kerrigan worked at the United Nations Security Council’s Commission d’Indemnisation in Geneva, Switzerland serving as their senior legal officer responsible for arbitrating losses sustained by international oil companies following the 1990 Iraq invasion of Kuwait. Ms. Kerrigan is a director of Team, Inc. where she sits on the Audit & Finance and Corporate Governance & Nominating Committees. She is also a member of the Board of Directors for Nine Point Energy, where she chairs the Audit Committee and serves on the Compensation Committee. Ms. Kerrigan is a past chairman of the State Bar of Texas International Law Section and a Life Fellow of the Texas Bar Foundation. She serves on the board of Southwestern University and is the Executive Director of the Kay Bailey Hutchison Center for Energy, Law and Business at the University of Texas in Austin.

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. 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.

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.

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.