Marathon Petroleum Corporation (NYSE:MPC) announced several major management changes effective August 1, 2024. The company disclosed the appointment of Maryann T. Mannen as the new Chief Executive Officer, succeeding Michael J. Hennigan. Mannen has served as President since January of this year, after previously serving as Executive Vice President and Chief Financial Officer since January 2021. Hennigan will transition from CEO to Executive Chairman of the Board. Apart ...