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Mark J. Pospisil is Vice President of Geology and Geophysics for XTO Energy Inc. Mr. Pospisil received a BS in Geology from Arizona State University and an MBA from the University of Dallas. Mr. Pospisil joined XTO in 1997 as Manager of Exploration. He is a certified Petroleum Geologist and has worked for over 20 years as a geologist in the petroleum industry with various companies. | 