Frank M Semple

Semple retired in 2016 as chairman, president and CEO of Mark West Energy Partners L.P., joining the company in 2003. Previously, he was COO of WilTel Communications, SVP and general manager of Williams Natural Gas Company, and VP of operations and engineering for Northwest Pipeline Company. He currently serves on the board of Choctaw Global LLC, an affiliate of the Choctaw Nation of Oklahoma.