John M. Fox

JOHN M. FOX has been President, Chief Executive Officer and Chairman of
the Board of Directors of MarkWest Hydrocarbons, Inc., since its
inception in April 1988. Mr. Fox was a founder of Western Gas Resources,
Inc., a company listed on the New York Stock Exchange, and was its
Executive Vice President and Chief Operating Officer from 1972 to 1986.
Mr. Fox holds a Bachelor’s degree in Engineering from the United States
Air Force Academy and a Master of Business Administration degree from
the University of Denver.