Dr Jeffrey Evans is Professor Emeritus of Bucknell University. He earned his BS, MS and PhD in Civil Engineering from Clarkson, Purdue, and Lehigh, respectively. In England, he has been a visiting academic at the University of Cambridge and University of Nottingham. His experience includes over 10 years as a consultant with Woodward-Clyde Consultants (now AECOM) and the U.S. Army Corps of Engineers Reserves, where he served as a 2nd and 1st Lieutenant and Captain.

Mr Daniel Ruffing is Vice President at Geo-Solutions, Inc., located near Pittsburgh, Pennsylvania. He earned his BS and MS in Civil and Environmental Engineering from Bucknell University. His experience includes over 10 years of design and construction on geoenvironmental components of projects, mainly focusing on the construction of slurry trenches, soil mixing, jet grouting, and grouting, all techniques that Geo-Solutions specializes and excels in. He has also worked in general environmental remediation and other more general construction.

Dr David Elton is Professor Emeritus of Auburn University. He earned his BS, MS and PhD in Civil Engineering from Clarkson, Utah State, and Purdue, respectively. His 30 years of research and teaching specialized in geotechnical and geosynthetics engineering. A former President of the North American Geosynthetics Society, he is an ASCE Fellow, has won teaching awards, research awards, authored two books (one an ASCE best-seller) and over 50 refereed papers. He is known world-over as the 'Soils Magician'.