Chapman Cronquist is a registered Professional Engineer in Texas with over 40 years of oil and gas reservoir engineering experience, both domestic and international, and in both operations and research. During 1985-1987, he chaired an SPE Task Force on Reserves Definitions and was an SPE Distinguished Lecturer on Reserves Definitions during 1987-1988. He was elected a Distinguished Member of SPE in 1988. Chap has written papers and/or made presentations on waterflooding, PVT behavior, improved oil recovery, gas reservoir performance, basic and advanced reservoir engineering, probabilistic methods, and reserves estimation. He has a BS in geology from Rensselaer Polytechnic Inst. and an MS in petroleum and natural gas engineering from Pennsylvania State U.