Maryann Mannen elected President and CEO, will join the Board of Directors Mike Hennigan to transition from CEO to Executive Chairman of the Board of Directors John Surma elected Lead Independent Director FINDLAY, Ohio, May 13, 2024 /PRNewswire/ -- Marathon Petroleum Corp. (NYSE: MPC) today announced its leadership transition plan, with all positions effective August 1, 2024. At that time, MPC President Maryann T. Mannen will succeed Michael J. Hennigan as Chief Executive Officer and will join the Board of ...