DR. CARL H. SONDERGELD is Professor and Curtis Mewbourne Chair, Mewbourne School of Petroleum and Geological Engineering at the University of Oklahoma. He has over 12 years in the field of education and over 19 years with Amoco as a Special Research Associate working in rock physics. He has developed course manuals, newsletters, web pages and two software packages: Rock Properties Database and Analysis System and Unified Rock Modeling Software. He has published over 75 papers on various subjects and he is principal or co-author on 14 patents. He received a Ph.D. in geophysics from Cornell University and both an M.A. and B.A. in geology from Queens College of the City of New York.