James J. Smolen, Ph.D. has over thirty years experience in cased hole well logging, applications, related research, and training. He began in the oil industry (1970) with Schlumberger and since 1980 has been an officer and director of Petroleum Computing, Inc., and an international consultant and trainer of cased hole logging. Dr. Smolen has numerous publications to his credit, including the 1996 PennWell text, Cased Hole and Production Log Evaluation. He was a Distinguished Lecturer for both the SPE and the SPWLA. Dr. Smolen holds a B.S. from Northwestern University and M.S. and Ph.D. degrees from the University of California, Berkeley.