# Maryann Mannen

> Maryann T. Mannen is chairman, president and CEO of Marathon Petroleum Corporation and MPLX GP LLC. An accounting graduate and MBA from Rider University, she spent decades at FMC Technologies and TechnipFMC before joining Marathon Petroleum as CFO in 2021. She became president in January 2024, CEO in August 2024 and chairman in January 2026. Her public work centers on operating performance, capital allocation, energy infrastructure and environmental stewardship.

- **Role:** Chairman, President and Chief Executive Officer at Marathon Petroleum Corporation and MPLX GP LLC
- **Organizations:** Marathon Petroleum Corporation, MPLX GP LLC, Prudential Financial, American Petroleum Institute, American Fuel and Petrochemical Manufacturers, U.S. Secretary of Energy Advisory Board, National Petroleum Council, Ohio Business Roundtable, The Business Council, Cynthia Woods Mitchell Pavilion, TechnipFMC (former), FMC Technologies (former), Sheller-Globe Corporation (former), Owens Corning (former)
- **Education:** Bachelor’s degree in accounting, Rider University, Master of Business Administration, Rider University
- **Known for:** Played a key role negotiating and executing the merger of FMC Technologies and Technip SA., Progressed from Marathon Petroleum CFO to president, CEO and chairman between 2021 and 2026., Chairs the American Petroleum Institute.

## Career timeline

- **1986** — Joined FMC, beginning a long career through its businesses and successors.
- **2007** — Became vice president of administration at FMC Technologies.
- **2010** — Became deputy CFO and treasurer at FMC Technologies.
- **2011** — Became CFO at FMC Technologies.
- **2017** — Became executive vice president and CFO of merged TechnipFMC.
- **2021-01** — Joined Marathon Petroleum as executive vice president and CFO.
- **2021-02** — Joined the board of MPLX GP LLC.
- **2024-01** — Became president of Marathon Petroleum.
- **2024-08** — Became president and CEO of Marathon Petroleum and MPLX GP LLC; joined the MPC board.
- **2026-01** — Became chairman of Marathon Petroleum and MPLX GP LLC.
- **2026-05** — Joined Prudential Financial’s board.

## Achievements

- Played a key role negotiating and executing the merger of FMC Technologies and Technip SA.
- Progressed from Marathon Petroleum CFO to president, CEO and chairman between 2021 and 2026.
- Chairs the American Petroleum Institute.
- Serves on Prudential Financial’s board following prior board service at Owens Corning.

## Latest updates

- **2026-08** — On August 4, Marathon Petroleum reported second-quarter net income attributable to MPC of $5.1 billion and crude capacity utilization of 94%.
- **2026-08** — On August 3, Marathon and MPLX published joint sustainability and climate-scenario reports, reporting that their 2030 GHG and freshwater-withdrawal goals had been achieved five years early.
- **2026-07** — Listed among attendees of the July 20 Secretary of Energy Advisory Board meeting.
- **2026-05** — Joined Prudential Financial’s board; current MPC biography confirms committee assignments.
- **2026-01** — Became chairman of Marathon Petroleum and MPLX GP LLC while remaining president and CEO.

## Links

- Website: https://www.marathonpetroleum.com/About/Leadership/
- LinkedIn: https://www.linkedin.com/in/maryann-mannen-999b5551

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Profile page: https://yespress.io/maryann-mannen
Published by YesPress — https://yespress.io
Last updated: 2026-10-21