Leadership

Michael J. HenniganPresident and Chief Executive Officer

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

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 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. He assumed his current position on March 17, 2020.

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

Mr. Hennigan serves on the boards of directors of Marathon Petroleum Corporation, MPLX GP LLC and Nutrien Ltd.

Maryann T. MannenExecutive Vice President and Chief Financial Officer

Ms. Mannen is executive vice president and chief financial officer of Marathon Petroleum Corporation.

Prior to joining Marathon Petroleum 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 boards of directors of MPLX GP LLC and Owens Corning, where she has served as the audit committee chair since 2019. She also serves as vice chairman of the Cynthia Woods Mitchell Pavilion board of directors and is a member of its executive and finance committees. Additionally, she is the chair of the committee of trustees and a member of the board of The Awty International School.

Timothy J. AydtExecutive Vice President, Refining

Mr. Aydt is executive vice president, Refining of Marathon Petroleum Corporation. He is also executive vice president of MPLX GP LLC.

Mr. Aydt joined Marathon in 1985 as a pipeline engineer. He held a series of positions of increasing responsibility in Marketing and Transportation Engineering’s pipeline and retail divisions. In 1991, he helped develop a crude pipeline and trucking project in Tunisia, North Africa. He returned to pipeline operations in Wyoming in 1992, before being named pipeline engineering manager in 1995. In 1999, Mr. Aydt was named project director for the development and construction of the Cardinal Pipeline, which runs from Kenova, West Virginia, to Columbus, Ohio. He was named engineering department manager at the Robinson refinery in 2003, and manager of refining major projects in 2005. Mr. Aydt served as project director for the $2.2 billion Detroit Heavy Oil Upgrade Project from 2008, until its completion in 2012 and was named general manager of Terminal, Transport and Rail in 2013. In 2017, he was appointed president, Marathon Pipe Line LLC and vice president, operations of MPLX GP LLC. In 2018, Mr. Aydt was named vice president, business development of MPLX GP LLC. In 2020, he was named chief commercial officer and executive vice president, Pipelines, Terminals and Marine and assumed his current position in 2022.

Mr. Aydt graduated from the University of Missouri-Rolla with a bachelor’s degree in mechanical engineering in 1985. He attended Wharton’s Advanced Management Program at the University of Pennsylvania in 2014.

Mr. Aydt is a board member of the American Petroleum Institute (API) Downstream Committee and a board member of the American Fuel and Petrochemical Manufacturers Association (AFPM). Mr. Aydt chairs the board of the Louisiana Offshore Oil Port (LOOP) and served as past owner representative of Capline, both of which are significant entities in the nation’s crude oil infrastructure. Mr. Aydt served as past board member of the Association of Oil Pipe Lines (AOPL), past member of the American Petroleum Institute’s (API) pipeline subcommittee steering group; served on the API-AOPL Pipeline Safety Excellence Steering Committee; and served on the U.S. Department of Transportation’s Technical Hazardous Liquid Pipeline Safety Standards Committee.

Suzanne GagleGeneral Counsel and Senior Vice President, Government Affairs

Ms. Gagle is general counsel and senior vice president, government affairs of Marathon Petroleum Corporation. She is also general counsel of MPLX GP LLC.

Ms. Gagle began her career with Marathon in 1992 as a staff attorney. After various assignments in the Law organization, she was appointed to a leadership role in Marathon Ashland Pipe Line LLC in 2002. In 2003, Ms. Gagle returned to the Law organization as group counsel, litigation, and in 2010 was promoted to senior group counsel, downstream operations. She was appointed assistant general counsel, litigation and Human Resources in 2011. In 2012, Ms. Gagle led the legal team in an initial public offering of common units representing limited partner interests in MPC’s master limited partnership, MPLX LP. She was named vice president and general counsel of MPC in 2016 and general counsel of MPLX in 2017.  She assumed her current position in 2021.

Ms. Gagle earned a bachelor’s degree in business administration from the University of Toledo in 1987 and Juris Doctor from the University of Toledo College of Law in 1992. She completed the Executive Development Program at Northwestern University’s Kellogg School of Management in 2013.

Ms. Gagle currently serves on the board of directors of the Blanchard Valley Health Foundation and as a member of the University of Toledo paralegal studies advisory board. She is a former Ronald McDonald House Charities of Northwest Ohio board member.

Fiona C. LairdChief Human Resources Officer and Senior Vice President, Communications

Ms. Laird is chief Human Resources officer and senior vice president, Communications of Marathon Petroleum Corporation. 

Ms. Laird joined MPC in 2018, where she leads the company’s Human Resources function. Most recently, she served as chief Human Resources officer at Andeavor. Prior to that, Ms. Laird was the chief Human Resources and Communications officer for Newell Brands. Previously, Ms. Laird served in many HR, communications and legal positions over a 25-year career at Unilever. Her latter responsibilities at Unilever were as executive vice president global Human Resources based in London; and as senior vice president, Human Resources and Communications for Unilever’s North and Latin American geographies. Prior to joining Unilever, Ms. Laird practiced law at the New York law firm of Mudge, Rose, Guthrie, Alexander & Ferdon; and in the Cleveland office of Porter, Wright, Morris & Arthur LLC.  She assumed her current position in 2021.

Ms. Laird is a graduate of the University of Strathclyde in Glasgow, Scotland, where she completed a double major program in English and history. She holds a Juris Doctor degree, with honors, from the Case Western Reserve University School of Law.

From 2013-2018, Ms. Laird was a non-executive director of N. Brown Group PLC, a leading United Kingdom clothing, footwear and household goods retailer, where she chaired both the Remuneration and Corporate Social Responsibility Committees.

C. Kristopher HagedornSenior Vice President and Controller

Mr. Hagedorn is senior vice president and controller of Marathon Petroleum Corporation.

Prior to joining Marathon Petroleum Corporation, he served as Vice President and Controller of MPLX GP LLC since 2017. Prior to joining MPLX, Mr. Hagedorn was vice president and controller at CONSOL Energy Inc. He was a key member of the leadership team that prepared for the formation and initial public offering of a midstream master limited partnership formed by CONSOL Energy, and served as the partnership's chief accounting officer. Mr. Hagedorn joined CONSOL in 2012 as director, financial accounting and was named assistant controller in 2014, and vice president and controller in 2015. He served as chief accounting officer for CONE Midstream Partners LP from 2014 to 2015. Mr. Hagedorn joined PricewaterhouseCoopers in 1998. During his 14-year career with PwC, he held the positions of audit associate, audit senior associate, audit manager and audit senior manager. He was named vice president and controller of MPLX GP LLC in 2017 and assumed his current position in 2021.

Mr. Hagedorn earned a bachelor’s degree in accounting from West Virginia University. He is a licensed certified public accountant in Pennsylvania.

David R. HeppnerSenior Vice President, Strategy and Business Development

Mr. Heppner is senior vice president, Strategy and Business Development. Mr. Heppner is also senior vice president for MPLX GP LLC.

Mr. Heppner joined Marathon in 1988, where he held a variety of positions of increasing responsibility, including design engineer, construction engineer and project manager. In 1995, Mr. Heppner transferred to Emro Marketing Company, the predecessor of Speedway LLC, where he held various positions including purchasing and commercial services manager; business development manager; director of engineering services; and vice president of operations. In 2010, he was appointed director, wholesale marketing at MPC. In 2014, Mr. Heppner was appointed vice president of transition at Speedway. He was later named senior vice president of engineering services and corporate support at Speedway. He was named vice president, Commerical and Business Development in 2018 and assumed his current position in 2021.

Mr. Heppner graduated from Ohio Northern University in 1988 with a Bachelor of Science degree in electrical engineering. He is a registered professional engineer in the state of Illinois. Mr. Heppner attended the Wharton School Advanced Management Program in 2013.

Mr. Heppner serves on the Board of Trustees at Ohio Northern University as well as the board for Habitat for Humanity. He recently served as president of the United Way of Clark, Champaign and Madison Counties board of trustees, vice president of membership for the Boy Scouts of America, Black Swamp Council and was the campaign chairman for the Clark County March of Dimes. Mr. Heppner is a past member of the Children’s Miracle Network’s Board of Governors and Dayton Children’s Hospital Foundation board of trustees, as well as a past member of Wright State University College of Engineering and Computer Science External Advisory Board.

Rick D. HesslingSenior Vice President, Global Feedstocks

Mr. Hessling is senior vice president, Global Feedstocks of Marathon Petroleum Corporation. He is also senior vice president of MPLX GP LLC.

Mr. Hessling began his career with Marathon in 1990, as a lessee marketing representative in Michigan. In 1994, he was named acquisition specialist and jobber marketing representative in Michigan. Mr. Hessling relocated to MPC’s Findlay, Ohio, office in 2000 where he was named Midwest exchange negotiator and domestic spot crude oil trader in 2001. In 2002, he was named Marketing coordinating manager and distillate pricing manager in 2004. In 2005, Mr. Hessling was named brand southern district manager in Atlanta. He returned to Findlay in 2011 as crude oil and logistics analysis manager. Mr. Hessling was appointed manager, crude oil and natural gas supply and trading manager in 2014. He was named senior vice president, Crude Oil Supply and Logistics in 2018 and assumed his current position in 2021.

Mr. Hessling graduated with a bachelor’s degree in production management and marketing from Central Michigan University. He attended the Oxford Institute for Energy Studies in 2012

Ehren D. PowellSenior Vice President and Chief Digital Officer

Mr. Powell is senior vice president and chief digital officer of Marathon Petroleum Corporation.

Prior to joining MPC in 2021, Mr. Powell was the vice president and chief information officer of GE Healthcare. He was responsible for ensuring business value through technology systems and processes that provide transformational medical technologies and solutions to the global healthcare industry.

Mr. Powell began his career at GE in 2000 as a member of the GE Aviation IT leadership program. While at GE and its subsidiary companies, he had 20 years of experience holding several executive IT leadership roles with increasing responsibility.  In 2005, he was named the IT leader for services, global enterprise resource planning, and business intelligence platforms for GE Hitachi Nuclear Energy. In 2010, he joined GE Transportation as the chief information officer of services and in 2014 became senior vice president and chief information officer of power services with GE Power. Mr. Powell was named senior vice president and chief information officer of services for parent company GE in 2017.

Mr. Powell has a bachelor’s degree in business administration, management and information systems from the University of Cincinnati.

James R. WilkinsSenior Vice President, Health, Environment, Safety and Security

Mr. Wilkins is senior vice president, Health, Environment, Safety and Security of Marathon Petroleum Corporation.

After a short time as a field engineer with Dowell Schlumburger, Mr. Wilkins began his career with Marathon in October 1990 at the Garyville refinery in Louisiana. He held various environmental roles until 1997 when he was promoted to Environmental and Safety manager at Garyville. In 1999, Mr. Wilkins transferred to corporate refining operations supporting the environmental, safety, and security functions within the organization. In 2004, he was promoted to manager, Refining Environmental, Safety and Security. In 2013, Mr. Wilkins assumed responsibility over process safety management (PSM) and promoted to director, Refining Environmental, Safety, Security, and PSM. In 2016, Mr. Wilkins assumed company-wide oversight responsibility and was named director, Environment, Safety, Security, and Product Quality. He was named vice president, Environment, Safety and Security in 2018 and assumed his current position in 2021.

Mr. Wilkins received a Bachelor of Science degree in chemical engineering from the University of Wisconsin at Madison in 1989.

Molly R. BensonVice President, Chief Securities, Governance and Compliance Officer and Corporate Secretary

Ms. Benson is vice president, chief securities, governance and compliance officer and corporate secretary of Marathon Petroleum Corporation. She is also vice president, chief securities, governance and compliance officer and corporate secretary of MPLX GP LLC.

Ms. Benson began her career with Marathon as a tax attorney in 1998. She was named Government Affairs manager in 2001 and joined the Law organization as an operations attorney in 2003. Ms. Benson was promoted to senior attorney, downstream business in 2006 and to group counsel, North American production for Marathon Oil Company in Houston in 2010. Ms. Benson was named Marathon Petroleum Corporation group counsel, Law - Corporate and Finance in 2011 and assistant general counsel, Law - Corporate and Finance in 2012. She assumed her current position in 2016.

Ms. Benson graduated from The Ohio State University in 1987 with a bachelor’s degree in political science and a Juris Doctor degree from the University of Toledo College of Law in 1997. She completed the Executive Development Program at Northwestern University’s Kellogg School of Management in 2014.

Ms. Benson currently serves on the board of counselors for the University of Findlay and the board of directors for the Hancock Properties Foundation.

Kristina A. KazarianVice President, Finance and Investor Relations

Ms. Kazarian is vice president, Finance and Investor Relations of Marathon Petroleum Corporation. She is also vice president, Finance and Investor Relations of MPLX GP LLC.

Prior to joining Marathon Petroleum in 2018 as Vice President, Investor Relations, Ms. Kazarian was a managing director and head of the MLP, Midstream, and Refining Equity Research teams at Credit Suisse. She also worked at Deutsche Bank where she started as a director and was eventually promoted to managing director of MLP, Midstream, and Natural Gas Equity Research. Her career began at Fidelity Management & Research Company where she served as an analyst specializing on various energy industry subsectors. Ms. Kazarian was named to her current position in January 2023.

Ms. Kazarian graduated from Wellesley College with a Bachelor of Arts degree in economics and political science. She also earned a Master of Business Administration in finance and strategic management from the Wharton Business School at the University of Pennsylvania.

Timothy J. AydtExecutive Vice President, Refining

Mr. Aydt is executive vice president, Refining of Marathon Petroleum Corporation. He is also executive vice president of MPLX GP LLC.

Mr. Aydt joined Marathon in 1985 as a pipeline engineer. He held a series of positions of increasing responsibility in Marketing and Transportation Engineering’s pipeline and retail divisions. In 1991, he helped develop a crude pipeline and trucking project in Tunisia, North Africa. He returned to pipeline operations in Wyoming in 1992, before being named pipeline engineering manager in 1995. In 1999, Mr. Aydt was named project director for the development and construction of the Cardinal Pipeline, which runs from Kenova, West Virginia, to Columbus, Ohio. He was named engineering department manager at the Robinson refinery in 2003, and manager of refining major projects in 2005. Mr. Aydt served as project director for the $2.2 billion Detroit Heavy Oil Upgrade Project from 2008, until its completion in 2012 and was named general manager of Terminal, Transport and Rail in 2013. In 2017, he was appointed president, Marathon Pipe Line LLC and vice president, operations of MPLX GP LLC. In 2018, Mr. Aydt was named vice president, business development of MPLX GP LLC. In 2020, he was named chief commercial officer and executive vice president, Pipelines, Terminals and Marine and assumed his current position in 2022.

Mr. Aydt graduated from the University of Missouri-Rolla with a bachelor’s degree in mechanical engineering in 1985. He attended Wharton’s Advanced Management Program at the University of Pennsylvania in 2014.

Mr. Aydt chairs the board of the Louisiana Offshore Oil Port (LOOP) and served as past owner representative of Capline, both of which are significant entities in the nation’s crude oil infrastructure. Mr. Aydt served as past board member of the Association of Oil Pipe Lines (AOPL), past member of the American Petroleum Institute’s (API) pipeline subcommittee steering group; served on the API-AOPL Pipeline Safety Excellence Steering Committee; and served on the U.S. Department of Transportation’s Technical Hazardous Liquid Pipeline Safety Standards Committee.