Jeffrey Geslin, Ph.D. -
Geologist and Geophysicist
Jeffrey Geslin is a consultant and educator living in Durango, Colorado. He received his Ph.D. in geology from the University of California Los Angeles in 1993 after completing geoscience degrees from the University of Northern Colorado (BA) and Idaho State University (MS). Jeff held post-doctoral research positions with the USGS and Idaho State University before joining ExxonMobil in 1998. At ExxonMobil, Jeff held positions across the upstream, from research to exploration and production. He worked on projects in numerous locations globally, including southeast Asia, west Africa, eastern Canada, and eastern Russia. Jeff held several technical and managerial positions at ExxonMobil, and most recently was the corporation’s Senior Technical Consultant in Stratigraphy. He retired from ExxonMobil in late 2018. He is now the owner of Pictured Cliffs Geoscience LLC, and an Adjunct Professor of Geology at Fort Lewis College.
Jeff’s technical interests include: 1) Petroleum geology, specifically reservoir performance evaluation, stratigraphic controls on play elements, acreage and prospect evaluation, integrated conventional production activities, and stratigraphic controls on unconventional reservoir performance; 2) Sequence stratigraphic evaluation of clastic strata, including fluvial, shallow-marine and deep-marine environments; 3) Applied geophysics (seismic interpretation and seismic sequence stratigraphy); and 4) Teaching, advising and mentoring geoscientists. Jeff has published over 60 articles, abstracts and technical reports.