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Maryann T. Mannen Named CEO of Marathon Petroleum

Marathon Petroleum, ranked No. 16 on the Fortune 500, announced that Maryann T. Mannen will succeed Michael J. Hennigan as CEO and join the board of directors, effective August 1. Mannen, currently the company’s president since January 1, will become the first female CEO in Marathon’s history. She has been serving as Executive Vice President and Chief Financial Officer since 2021, a role in which she also broke new ground as the company’s first female CFO…

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