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John C. Mollenkopf Senior Vice President Chief Operations Officer was appointed as Chief Operations Officer of both MarkWest Hydrocarbon and the general partner of MarkWest Energy Partners in October 2006. Prior to his appointment as COO Mr. Mollenkopf served as Senior Vice President Southwest Business Unit since January 2004 and as Vice President Business Development since January 2003. Prior to these positions he served as Vice President Michigan Business Unit of MarkWest Energy’s general partner since its inception in May 2002 and in the same capacity with MarkWest Hydrocarbon since December 2001. Prior to that Mr. Mollenkopf was General Manager of the Michigan Business Unit of MarkWest Hydrocarbon since 1997. He joined MarkWest Hydrocarbon in 1996 as Manager New Projects. From 1983 to 1996 Mr. Mollenkopf worked for ARCO Oil and Gas Company holding various positions in process and project engineering as well as operations supervision. | 