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Nancy K. Buese (formerly Masten) Senior Vice President Chief Financial Officer was appointed Chief Financial Officer of both MarkWest Hydrocarbon and the general partner of MarkWest Energy Partners in October 2006. Prior to her appointment as CFO Ms. Buese served as Chief Accounting Officer of the Company and the Partnership�s general partner since November 2005. Prior to joining MarkWest Ms. Buese was the Chief Financial Officer for Experimental and Applied Sciences (EAS) in Golden Colorado. EAS is a wholly owned subsidiary of the Ross Product Division of Abbott Laboratories. Prior to her employment at EAS Ms. Buese was a Vice President with TransMontaigne Inc. in Denver Colorado. Preceding this appointment Ms. Buese was a Partner with Ernst & Young LLP having spent time in the firm�s Denver London New York and Washington D.C. offices. | 