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Frank M. Semple President Chief Executive Officer and Director was appointed as President of both MarkWest Hydrocarbon and the general partner of MarkWest Energy Partners on November 1 2003. Mr. Semple also became Chief Executive Officer of both MarkWest Hydrocarbon and the general partner of MarkWest Energy Partners on January 1 2004. Prior to his appointment Mr. Semple served in various capacities most recently as Chief Operating Officer of WilTel Communications formerly Williams Communications Group Inc. (WCG) from 1997 to 2003. Prior to his tenure at WilTel Communications he was the Senior Vice President/General Manager of Williams Natural Gas from 1995 to 1997 Vice President of Marketing and Vice President of Operations and Engineering for Northwest Pipeline and Director of Product Movements and Division Manager for Williams Pipeline during his 22-year career with The Williams Companies. During his tenure at Williams Communications he also served on the board of directors for PowerTel Communications and the Competitive Telecommunications Association (Comptel). Mr. Semple holds a Mechanical Engineering degree from the United States Naval Academy and is a professional engineer registered in the State of Kansas. | 