Frank Semple

Mr. Frank M. Semple is an Independent Director at Marathon Petroleum Corp. and a Chairman, President & Chief Executive Officer at MarkWest Hydrocarbon LLC. He is on the Board of Directors at Marathon Petroleum Corp., MPLX GP LLC and Choctaw Global LLC. Mr. Semple was previously employed as an Independent Director by Tortoise Acquisition Corp., a Chairman, President & Chief Executive Officer by MarkWest Energy GP LLC, a Chairman, President & Chief Executive Officer by MarkWest Energy Partners LP, a Chief Operating Officer by WilTel Communications LLC, a Senior Vice President & General Manager by Williams Natural Gas Co., a Vice President-Operations & Engineering by Northwest Pipeline LLC, a Chief Operating Officer by Williams Communications Group, Inc., a Division Manager by Williams Pipe Line Co. LLC, a Director-Product Movements & Division Manager by Williams Pipeline Partners LP, and a Chief Operating Officer by WilTel Communications Group LLC. He also served on the board at Andeavor Logistics LP, Tesoro Logistics GP LLC, MPLX LP, Equess Communications, Inc. and INCOMPAS. He received his undergraduate degree from United States Naval Academy.