Maryann Mannen recently assumed the role of chairman of the board at Marathon Petroleum, succeeding Michael Hennigan, who has retired from his position as executive chairman and as a member of the board of directors. John Surma will continue to serve as independent lead director of the board.
“We congratulate Maryann as our new chairman of the board. We are confident in Maryann’s leadership and enthusiastic about our company’s direction. We thank Mike for his exemplary service during a period of significant value creation,” John Surma said.
“Mike’s continued leadership and remarkable achievements have been pivotal for MPC’s positive trajectory. It’s an honour to succeed Mike as chairman of the board and to have the opportunity to build on that legacy of leadership and success, taking our performance to the next level. I appreciate the trust our board has placed in me as we look ahead to MPC’s future,” Maryann Mannen said.
In March 2020, Michael Hennigan took over as CEO of MPC. In August 2024, he became executive chairman.
Who is Maryann Mannen?
Maryann Mannen graduated from Rider University with a Master of Business Administration (MBA) and a bachelor’s degree in accounting. Since then, she has established herself as a veteran in various fields, including corporate finance, strategic planning, and executive management. She has also held leadership positions in complex, capital-intensive industries.
Before joining FMC Technologies, she gained experience in finance roles, including a position at Sheller-Globe Corporation. Mannen worked at FMC Technologies for over thirty years, advancing through increasingly senior roles and acquiring extensive knowledge in corporate governance, financial oversight, and international operations. Her tenure demonstrated a consistent ascent based on strategic financial leadership and operational discipline.
Maryann Mannen eventually rose to Chief Financial Officer at FMC Technologies, and then at TechnipFMC after the merger of FMC Technologies and Technip SA, overseeing large-scale global operations, merger integration, and capital allocation in the energy services space, earning her a reputation as a disciplined and effective financial leader as CFO and executive vice president.
She became Executive Vice President and Chief Financial Officer of Marathon Petroleum Corporation in 2021, followed by promotions to President and Chief Executive Officer (CEO) in 2024. Maryann Mannen is also an external board member (Owens Corning) and is involved in major industry organisations, having advanced from financial leadership to top executive management in the American energy industry.