Mr. Hennigan has led the general partner of MPLX as chairman of the board of directors since April 2020, as CEO from November 2019 to August 2024, and as President from June 2017 to August 2024. Ms. Mannen has served as CEO since August 2024 and as a member of the board of directors since February 2021. Also announced today and effective Jan. 1, 2026, Mr. Hennigan will retire as executive chairman of MPC, with Ms. Mannen to succeed him as chairman and continuing to lead MPC as its president and CEO. About M ...