Marathon Petroleum Corporation (MPC) and MPLX LP announced that Gregory J. Goff, executive vice chairman of MPC and a member of each of the boards of directors of MPC and MPLX's general partner, has elected to retire effective December 31, 2019. Mr. Goff was named executive vice chairman upon the closing of MPC's strategic combination with Andeavor in October 2018, and he has served on the board of directors of both MPC and MPLX. Mr. Goff will retire from both boards concurrent with his retirement and Frank M. Semple will succeed Mr. Goff as a member of the MPC board.