OREANDA-NEWS. December 07, 2015.  Marathon Petroleum Corporation (NYSE: MPC) today announced the completion of the previously announced merger by which MarkWest Energy Partners, L.P. became a wholly-owned subsidiary of MPLX LP (NYSE: MPLX).

Effective with the closing are the following executive and director appointments:

Frank M. Semple has been elected to the board of directors of MPC. Mr. Semple will also serve as vice chairman of the general partner of MPLX and has been elected to its board of directors. Mr. Semple previously served as MarkWest's chairman, president and chief executive officer. 

Randy S. Nickerson has been appointed executive vice president, corporate strategy of MPC. Mr. Nickerson previously served as MarkWest's executive vice president and chief commercial officer.