Mr. Timothy S. Brown is Geophysical Manager for Sierra. Mr. Brown received a BA in Geology from Duke University in 1965 and a Masters of Science in Geology from the University of South Carolina in 1967. Mr. Brown has over 38 years experience in the oil and gas business. His past employers include Pan American Petroleum Corporation (Amoco) and R. Brewer & Co. (international consulting firm, Executive V.P.), TSB EXCO INC., a successful oil and gas exploration firm, and CAEX SERVICES INC., a highly respected oil and gas technology consulting firm, both of which were founded by Mr. Brown. He has worked most of the major basins in the United States along with international areas, including the North Sea, Europe, Mediterranean, South America, Indonesia, China and Australia.