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Michael A. Johnson has served as Senior Vice President - Accounting Controller and Chief Accounting Officer since 2000. He served as Vice President of Accounting and Financial Reporting from 1998 to 2000 and as Assistant Controller from 1993 to 1998. From 1991 to 1993 Mr. Johnson served as Project Manager for Phibro Energy Production Inc. a Russian joint venture. From 1987 to 1991 he was employed by Arthur Andersen & Co. Mr. Johnson is a Certified Public Accountant and graduated from the University of Texas at Austin in 1987. | 