MarkWest names new chief financial officer

By OGJ editors

HOUSTON, Nov. 25 -- Donald C. Heppermann has been named senior vice-president and chief financial officer of Denver-based MarkWest Hydrocarbon Inc. and MarkWest Energy GP LLC, the general partner of MarkWest Energy Partners LP. Heppermann succeeds Gerry Tywoniuk, who has been named senior vice-president and chief financial officer of Pacific Energy GP Inc., general partner of Pacific Energy Partners LP. Tywoniuk also resigned as director of the two MarkWest companies.

Heppermann's career in the energy industry began in 1965. He has held numerous positions in operations, finance, business development, and strategic planning. During 1990-97, he served as president and chief operating officer for InterCoast Energy Co., an unregulated unit of MidAmerican Energy Co. During 1987-90, Heppermann worked as vice-president, finance, for Pinnacle West Capital Corp., the holding company for Arizona Public Service Co. He has served as a director of MarkWest Energy GP since May.

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