Richard Selley is a Senior Research Fellow and Emeritus Professor of Petroleum Geology at Imperial College, London, where he has spent most of his career apart from several gap years employed by oil companies in the North Sea and abroad. He has over 50 years of experience in the teaching, research and practical application of geoscience to petroleum exploration. Richard's early research in the application of sedimentology in general and geophysical well logs in particular, to petroleum exploration has been rendered redundant by advances in seismic imaging. It is 30 years since he applied the Appalachian shale gas paradigm to Euroland and the UK. This research was ignored until recently. He has now achieved notoriety (outside the industry) as an advocate of hydraulic fracturing for shale gas and oil extraction. Richard has received various national and international honours, included the Silver Medal of the Geological Society of London, awarded for excellence in petroleum geoscience, and Honorary Membership of the Petroleum Exploration Society of GB. Richard's hobby is to research the impact of geology and climate change on viticulture; demanding research that requires considerable collateral conviviality. Dr. Stephen A. Sonnenberg is a Professor and holds the Charles Boettcher Distinguished Chair in Petroleum Geology at the Colorado School of Mines. He specializes in unconventional reservoirs, sequence stratigraphy, tectonic influence on sedimentation, and petroleum geology. A native of Billings, Montana, Sonnenberg received BS and MS degrees in geology from Texas A&M University and a Ph.D. degree in geology from the Colorado School of Mines. He has over twenty-five years experience in the industry. Steve has served as President of several organizations including the American Association of Petroleum Geologists, Rocky Mountain Association of Geologists, and Colorado Scientific Society. He also served on the Colorado Oil and Gas Conservation Commission from 1997-2003 and was the Chair of the Commission from 1999-2003. He is the recipient of the Young Alumnus Award, Outstanding Alumnus Award, and Mines Medal from the Colorado School of Mines, Distinguished Achievement Medal from Texas A&M University, distinguished service awards from AAPG and RMAG, and honorary membership awards from AAPG, RMAG and the Colorado Scientific Society. In 2013, he was awarded the Halbouty Medal from AAPG.

3rd edition.