Board of Directors

Michael J. HenniganExecutive Chairman

Director since 2020

Mr. Hennigan is executive chairman of Marathon Petroleum Corporation. He also serves as the executive chairman of MPLX GP LLC. He is the past chief executive officer of Marathon Petroleum Corporation and past chairman, president and chief executive officer of MPLX GP LLC.

Mr. Hennigan served as the chief executive officer of Marathon Petroleum Corporation and chairman, president and chief executive officer of MPLX GP LLC until August 2024, when he transitioned to executive chairman. Prior to joining MPLX GP LLC in 2017, Mr. Hennigan was president, crude, NGL and refined products of the general partner of Energy Transfer Partners L.P.  Prior to that, he served as president and chief executive officer of Sunoco Logistics Partners L.P. He was responsible for all operations and business activities, including setting the direction, strategy and vision for the company.

Mr. Hennigan began his career with Sunoco, Inc. in 1981 at the Marcus Hook refinery, working in various engineering and operations positions before joining the business planning department in 1990. In 1992, he transferred to the Philadelphia refinery before joining the corporate business planning group in 1993. There, he worked on various strategies for northeast refining before returning to Marcus Hook as business manager in 1996. In 1998, he returned to Sunoco’s corporate office as manager, financial analysis and strategic planning. In 2000, he was named general manager, northeast refining wholesale fuels marketing and product supply and in 2001 was appointed vice president, product trading, sales and supply. In 2006, Mr. Hennigan was appointed senior vice president, supply, trading, sales and transportation and senior vice president, business improvement in 2008. Mr. Hennigan joined Sunoco Logistics as vice president, business development in 2009. He was named president and chief operating officer in 2010 and was appointed as president and chief executive officer in 2012. In 2017, Mr. Hennigan was named president of MPLX GP LLC and in November 2019 was named president and chief executive officer. In 2020, he was named president and chief executive officer of Marathon Petroleum Corporation and in 2024, Mr. Hennigan served exclusively as the chief executive officer.

Mr. Hennigan holds a Bachelor of Science degree in chemical engineering from Drexel University.

Mr. Hennigan serves on the boards of directors of MPLX GP LLC, Nutrien Ltd. and The Cigna Group.

John P. SurmaLead Director

Director since 2011

Mr. Surma is the lead director of the board of Marathon Petroleum Corporation. He is also the retired chairman and chief executive officer of United States Steel Corporation.

Mr. Surma retired as the chief executive officer of United States Steel Corporation in September 2013 and as executive chairman in December 2013. Prior to joining United States Steel, Mr. Surma served in several executive positions with Marathon. He was named senior vice president, Finance & Accounting of Marathon Oil Company in 1997, president, Speedway SuperAmerica LLC in 1998, senior vice president, Supply and Transportation of Marathon Ashland Petroleum LLC in 2000 and president of Marathon Ashland Petroleum LLC in 2001. Prior to joining Marathon, Mr. Surma worked for Price Waterhouse LLP where he was admitted to the partnership in 1987. In 1983, Mr. Surma participated in the President’s Executive Exchange Program in Washington, D.C., where he served as executive staff assistant to the vice chairman of the Federal Reserve Board.

Mr. Surma earned a Bachelor of Science degree in accounting from Pennsylvania State University in 1976.

Mr. Surma is the lead director of Trane Technologies plc board of directors and is also a member of the boards of directors of MPLX GP LLC and Public Service Enterprise Group Incorporated (PSEG). He also is the chair of the board of directors of the University of Pittsburgh Medical Center. Mr. Surma formerly served as the chair of the board of directors of the Federal Reserve Bank of Cleveland and the National Safety Council. He was appointed by President Barack Obama to the President's Advisory Committee for Trade Policy and Negotiations and served as its vice chairman.

Abdulaziz F. AlkhayyalRetired Senior Vice President, Industrial Relations, Saudi Aramco

Director Since 2016

Mr. Alkhayyal is retired senior vice president, industrial relations of Saudi Aramco.

Mr. Alkhayyal joined Saudi Aramco in 1981, where he served in various company field operations. From 1993 to 1996, he served as a member of general management. Mr. Alkhayyal was named vice president, sales and marketing in 1996, vice president employee relations and training in 1997, and vice president, corporate planning in 1998. He was named senior vice president, international operations in 2000, where he was responsible for the development of Saudi Aramco downstream international business. Mr. Alkhayyal was named senior vice president, refining, marketing and international in 2001, and senior vice president industrial relations in 2007. He served in this position until his retirement from Saudi Aramco in 2014.

Mr. Alkhayyal received a bachelor’s degree in mechanical engineering in 1977, and a master’s degree in business administration in 1979, both from the University of California, Irvine. He attended the Advanced Management Program in 1995, at the University of Pennsylvania.

Mr. Alkhayyal serves on the boards of directors of National Gas and Industrialization Company, Halliburton Company and the International Youth Foundation.

Evan BayhSenior Advisor, Apollo Global Management

Director since 2011

Sen. Bayh is a senior advisor with Apollo Global Management. 

As a former U.S. senator and the governor of Indiana, Sen. Bayh has held numerous leadership positions. He was elected as Indiana's secretary of state in 1986 and as its governor in 1988. After two terms as governor, Sen. Bayh was elected to the U.S. Senate where he served for 12 years. Sen. Bayh’s committee assignments included Banking, Housing and Urban Affairs; Armed Services; Energy and Natural Resources; the Select Committee on Intelligence; Small Business and Entrepreneurship; and the Special Committee on Aging. During his time in office, he focused on job creation, national security, small business growth and many other critical domestic issues. 

Sen. Bayh received his bachelor’s degree in business with honors from Indiana University in 1978 and received his J.D. from the University of Virginia School of Law in 1981.

Sen. Bayh is a member of the boards of directors of Fifth Third Bancorp and RLJ Lodging Trust.

Jeffrey C. CampbellFormer Vice Chairman of the Board and CFO, American Express Company

Director since 2024

Mr. Campbell is the former vice chairman of the board and chief financial officer of American Express Company.

Mr. Campbell joined American Express Company, a globally integrated payments company, in 2013. Before joining American Express, Mr. Campbell was chief financial officer of the McKesson Corporation, a diversified healthcare services leader. Prior to his time at McKesson, Mr. Campbell spent 13 years at AMR Corporation and its principal subsidiary American Airlines, ultimately becoming the company's chief financial officer in 2002. Mr. Campbell progressed through a range of senior management roles at American Airlines, including leading the company's Europe, Middle East and Africa operations while based in London. Mr. Campbell began his professional career as a certified public accountant and management consultant with Deloitte, Haskins & Sells.

Mr. Campbell received a bachelor’s degree in economics from Stanford University and a Master of Business Administration degree from Harvard University.

Mr. Campbell serves on the boards of directors of Aon plc, Hexcel Corporation and The Juilliard School.

Jonathan Z. CohenFounder, Chief Executive Officer and President Hepco Capital Management, LLC

Director since 2019

Mr. Cohen is the founder, chief executive officer and president of Hepco Capital Management, LLC, a private investment firm since 2016. Mr. Cohen was the founder and co-executive chairman of the predecessor of BlackSky Technology, Inc. from 2018 to 2021.

Mr. Cohen was the chief executive officer of Osprey Energy Acquisition Corp., chairman of the board of Falcon Minerals Corporation, k/k/a Sitio Royalties Corp., from 2018 to 2020. He was co-founder and served in executive and board capacities of Atlas Energy and its affiliates and Atlas Pipeline Partners LP. He also held a variety of leadership positions, including: co-founder of the general partner of Arc Logistics Partners LP; chief executive officer from 2004 to September 2016, and president from 2003 to September 2016 of Resource America, Inc.; and founder and chief executive officer of Resource Capital Corp., now known as ACRES Commercial Realty. He was also the co-founder of Castine Capital Management, LLC from 2003 to 2020.

Mr. Cohen earned a Bachelor of Arts degree in 1992 from the University of Pennsylvania and a Juris Doctorate from the American University Washington College of Law.

Mr. Cohen serves as chair of the board of directors of Crane Harbor Acquisition Corporation, vice chairman of Lincoln Center Theater, a Trustee of the East Harlem School, a member of the board of overseers of the College of Arts and Sciences of the University of Pennsylvania, a trustee of The American School of Classical Studies in Athens, Greece, and trustee of Arete Foundation, a private family foundation. Mr. Cohen previously served on the boards of directors of Energen Corporation, Osprey Technology Acquisition Corp., Resource Capital Corp., Resource America, Inc. and Titan Energy, LLC.

Kimberly N. Ellison-TaylorFormer Executive Director, Finance Thought Leadership, Oracle Corporation

Director since 2024

Ms. Ellison-Taylor is the former executive director, Finance Thought Leadership, of Oracle Corporation and the chief executive officer of KET Solutions, LLC, which she founded in 2021. 

During her 17-year tenure with Oracle, Ms. Ellison-Taylor held senior leadership roles including executive director of Finance Thought Leadership; global strategy leader in the Cloud Business Group; global strategy director in the Financial Services Industry Group; and executive director and global leader of the Health, Human Services and Labor Solutions team. Prior to joining Oracle, she served as the chief information technology officer for Prince George’s County government in Maryland and also held roles at KPMG, Motorola and NASA’s Goddard Space Flight Center.

Ms. Ellison-Taylor holds a bachelor's degree in information systems management from the University of Maryland, Baltimore County; a Master of Business Administration degree from Loyola University; and a Master of Science degree in information technology management from Carnegie Mellon University. She is a certified public accountant, a certified internal auditor and a certified information systems auditor.

Ms. Ellison-Taylor serves on the boards of directors of Mutual of Omaha Insurance Company and U.S. Bancorp. She is also an adjunct professor teaching emerging technology and innovation for Carnegie Mellon University's Heinz College Executive Education program. She is a past chairman of the American Institute of CPAs and a past chairman of the Association of International Certified Professional Accountants.

Maryann T. MannenPresident and Chief Executive Officer

Director since 2024

Ms. Mannen is president and chief executive officer of Marathon Petroleum Corporation. She is also president and chief executive officer of MPLX GP LLC.

Ms. Mannen was named president of Marathon Petroleum Corporation in January 2024 and assumed her current role in August 2024. Previously, she served as executive vice president and chief financial officer of Marathon Petroleum Corporation since 2021.

Prior to joining Marathon Petroleum Corporation in 2021, Ms. Mannen served as executive vice president and chief financial officer of TechnipFMC, a leading global engineering services and energy technology company incorporated in the United Kingdom and headquartered in Paris and Houston. From 2011 to 2017, she was chief financial officer at FMC Technologies, prior to its merger with Technip SA, which Ms. Mannen played a key role in negotiating and executing. Before that, she served as the company's deputy chief financial officer and treasurer from 2010 to 2011 and vice president of administration from 2007 to 2010. Prior to joining FMC Technologies in 1986, Ms. Mannen was finance manager for Sheller-Globe Corporation.

Ms. Mannen holds a bachelor's degree in accounting and a Master of Business Administration degree from Rider University.

Ms. Mannen serves on the board of directors of MPLX GP LLC. She is a member of the Owens Corning board of directors, where she has served as the audit committee chair since 2019. Ms. Mannen also serves on the executive committee of the American Petroleum Institute (API), the executive committee of American Fuel and Petrochemical Manufacturers (AFPM), and the executive committee of the Ohio Business Roundtable, and is a member of The Business Council. She also serves as secretary of the Cynthia Woods Mitchell Pavilion board of directors and is a member of its executive and finance committees.

Eileen P. PatersonFormer Chief Executive Officer and President, Aerojet Rocketdyne Holdings, Inc.

Director since 2024

Ms. Paterson is the former chief executive officer and president of Aerojet Rocketdyne Holdings, Inc. (acquired by L3Harris Technologies, Inc. in 2023). 

Prior to joining Aerojet Rocketdyne in 2015, Ms. Paterson held various leadership roles with United Technology Corporation (UTC), including serving as president of Pratt & Whitney AeroPower’s auxiliary power unit and small turbojet propulsion business from 2012 to 2015. Before joining UTC, Ms. Paterson managed production operations at the Ford Motor Company and Visteon Corporation. 

Ms. Paterson is a U.S. Army veteran. She served for seven years as an active-duty U.S. Army aviator and was the airfield commander of Davison Army Airfield in Fort Belvoir, Virginia. She is a distinguished military graduate of the U.S. Army Aviation Officer School. 

Ms. Paterson received a Bachelor of Arts degree from The College of New Rochelle and a Master of Business Administration degree from Butler University. She also received an honorary doctorate degree in science from the University of Alabama in Huntsville. 

Ms. Paterson serves on the boards of Constellation Energy Corporation and Woodward, Inc. She previously served on the board of governors of the Aerospace Industries Association, the national board of directors of the Girl Scouts of the USA, and the National Space Council’s Users’ Advisory Group. 

Kim K.W. Rucker Former Executive Vice President, General Counsel and Secretary, Andeavor

Director Since 2018

Ms. Rucker is former executive vice president, general counsel and secretary of Andeavor.

Ms. Rucker served as executive vice president, general counsel and secretary for Andeavor and as executive vice president and general counsel for the general partner of Andeavor Logistics LP from 2016-2018. Prior to joining Andeavor, Ms. Rucker was executive vice president, Corporate and Legal Affairs, general counsel and corporate secretary of Kraft Foods Group, Inc. from 2012 to 2015, where she led the legal, corporate affairs and government affairs functions. In 2008, Ms. Rucker served as senior vice president, general counsel and chief compliance officer of Avon Products, Inc., and assumed the Corporate Secretary position in 2009. From 2004 to 2008, Ms. Rucker served as senior vice president, corporate secretary and chief governance officer for Energy Future Holdings, Corp. She was also corporate counsel for Kimberly-Clark Corporation and a Partner in the corporate and securities group at the law firm of Sidley Austin LLP. 

Ms. Rucker holds a Bachelor of Business Administration degree in economics from the University of Iowa, a master’s degree in public policy from the John F. Kennedy School of Government at Harvard University and a Juris Doctor from Harvard Law School.

Ms. Rucker is a member of the boards of directors of Celanese Corporation, HP Inc. and GE Vernova LLC. Additionally, she is on the board of directors of Haven for Hope and a member of the board of trustees of Johns Hopkins Medicine.

Frank M. SempleRetired Chairman, President and Chief Executive Officer MarkWest Energy Partners, L.P

Director since 2021

Mr. Semple is the retired chairman, president and chief executive officer of MarkWest Energy Partners, L.P. 

Mr. Semple joined MPLX in 2015, at the time of the MPLX and MarkWest combination and retired in 2016. He joined MarkWest in 2003, as president and chief executive officer and was elected chairman of the board in 2008. Prior to joining MarkWest, Mr. Semple completed a 22-year career with The Williams Companies and WilTel Communications. He served as the chief operating officer of WilTel Communications, senior vice president/general manager of Williams Natural Gas Company, vice president, operations and engineering for Northwest Pipeline Company and division manager for Williams Pipeline Company. Prior to his time at The Williams Companies, Mr. Semple served in the U.S. Navy.

Mr. Semple earned a bachelor’s degree in mechanical engineering from the United States Naval Academy. He completed the Program for Management Development at Harvard Business School.

Mr. Semple serves on the boards of directors of MPLX GP LLC, Choctaw Global, LLC, an affiliate of the Choctaw Nation of Oklahoma, National Cowboy & Western Heritage Museum and the Semple Family Museum of Native American Art.

J. Michael SticeProfessor, University of Oklahoma, and Former Chief Executive Officer, Access Midstream

Director since 2017

Mr. Stice is a professor at the University of Oklahoma and previously served as the Dean, Mewbourne College of Earth and Energy, the University of Oklahoma.

Mr. Stice began his career in 1981 with Conoco, as an associate engineer. He held engineering positions of increasing responsibility prior to being named plant manager of Louisiana Gas System Inc. in 1987. In 1991, Mr. Stice was named district manager for the Oklahoma district. He was appointed managing director of Conoco Australia Pty. Ltd. in 1995 and president, Conoco Asia Pacific Ltd. in 1997. Mr. Stice was promoted to president of Conoco Energy Solutions in 2001 and president of ConocoPhillips Qatar in 2003. In 2008, Mr. Stice was named president and chief operating officer of Chesapeake Midstream Development, L.P., a wholly owned subsidiary of Chesapeake Energy Corporation, and senior vice president of natural gas projects for Chesapeake. In 2009, he was named chief executive officer of Chesapeake Midstream Partners, L.P. Mr. Stice was designated a director of Chesapeake Midstream Partners, which changed its name to Access Midstream in 2012. He continued as chief executive officer until his retirement in 2014. Mr. Stice served as Dean, Mewbourne College of Earth and Energy at the University of Oklahoma since August 2015 and assumed his current position in January 2023.

Mr. Stice holds a bachelor’s degree in chemical engineering from the University of Oklahoma, a master’s degree in business from Stanford University, and a doctorate in education from The George Washington University.

Mr. Stice serves on the boards of directors of MPLX GP LLC and Kosmos Energy Ltd. He previously served on the boards of directors of MarkWest Energy Partners, L.P. and Spartan Acquisition III Corp.