Proxy Advisory Firms Glass Lewis and Egan-Jones Recommend that MarkWest Unitholders Vote “For” the Combination of MarkWest and MPLX

DENVER--(BUSINESS WIRE)--MarkWest Energy Partners, L.P. (NYSE: MWE) (MarkWest) announced today that Glass Lewis & Co., LLC (“Glass Lewis”), and Egan-Jones Proxy Services (“Egan-Jones”), two independent proxy advisory firms, have issued reports recommending that MarkWest unitholders vote “FOR” the combination of MarkWest and MPLX (NYSE: MPLX). The recommendations of Glass Lewis and Egan-Jones follow Institutional Shareholder Services Inc.’s (ISS) recent report that also recommended that MarkWest unitholders vote “FOR” the MarkWest-MPLX combination.