Fred Paillet, Ph.D., is adjunct professor of geosciences at the University of Arkansas and emeritus research scientist with the U.S. Geological Survey. He was project chief conducting research in borehole geophysics with the USGS for more than 20 years and has continued research with academic appointments at the University of Maine, University of Rennes, and the University of Queensland since that time. Paillet was one of the principle investigators on the long-term USGS fractured rock aquifer study at Mirror Lake, New Hampshire. He has also worked extensively with the U.S. Environmental Protection Agency at various Superfund sites, and with environmental agencies in the states of New York, Massachusetts, North Carolina, Connecticut, Wisconsin, and Minnesota. Paillet has also served as an instructor for numerous short courses on the application of borehole geophysics in hydrogeology conducted by NGWA, U.S. EPA, USGS, and U.S. Army Corps of Engineers.