John Williams has an M.S. in Geology from Penn State University and currently is the Groundwater Specialist for the U.S. Geological Survey Water Science Center in New York. He is an integral part of a Survey-wide training and technology transfer program in borehole geophysics. Williams also has provided technical assistance to the U.S. Environmental Protection Agency, the Army Corps of Engineers, the Nuclear Regulatory Commission, and state cooperators on borehole-geophysical applications in a wide range of groundwater investigations in fractured bedrock.