Marathon Petroleum Corporation and MPLX LP announce MPLX senior management changes

FINDLAY, Ohio, Aug. 24, 2016 - Marathon Petroleum Corporation (NYSE: MPC) Chairman, President and Chief Executive Officer Gary R. Heminger today announced changes in the senior management structure of the general partner of MPLX LP (NYSE: MPLX), MPC's master limited partnership, and MarkWest Energy Partners, L.P., a wholly owned subsidiary of MPLX. The changes will be effective Oct. 1, 2016.

John C. Mollenkopf, executive vice president and chief operating officer, MarkWest Operations, of MPLX's general partner, has decided to retire after a 33-year career in the energy industry. Mollenkopf joined MarkWest Hydrocarbon in 1996 as manager, new projects, and, after a series of assignments of increasing responsibility, became one of the founding members of the general partner of MarkWest at its initial public offering in 2002. In 2003, Mollenkopf became vice president, Business Development, for MarkWest and completed the company's first three acquisitions marking its entrance into the Southwest region. In 2004 he became senior vice president, Southwest Business Unit, and then in 2006, he was named chief operating officer. Mollenkopf was named executive vice president of MPLX's general partner in December 2015, when MarkWest became a subsidiary of MPLX.

"John's impact on MarkWest will be recognized long after he retires, particularly in the influential leadership role he played in growing the company's operations and facilities, which have provided best-in-class service to our customers for over a decade," said Heminger. "John was one of the founding members of MarkWest Energy Partners and we celebrate his many contributions to our company and industry, and wish him and his family all the best in his well-earned retirement."

Gregory S. Floerke, currently serving as executive vice president and chief commercial officer, MarkWest Assets, of MPLX's general partner, will assume the role of executive vice president and chief operating officer, MarkWest Operations, and report to Donald C. Templin, president of MPLX's general partner. He will remain at MarkWest's offices in Denver.

"In addition to his commercial experience, Greg has a deep understanding of MarkWest's operations gained during his leadership of the company's Marcellus and Utica shale activities," Heminger said. "Greg is extremely well-positioned for this assignment and we are confident that he will deliver on our strategic goal of remaining No. 1 in customer satisfaction."