Kevin Dennehy is the Coordinator for the U.S. Geological Survey's Groundwater Resources Program in Reston, Virginia. The Groundwater Resources Program focuses on national and regional interests in groundwater by conducting multidisciplinary, large-scale studies of groundwater availability and by developing new field techniques, geophysical methods, and computer models to monitor and analyze groundwater systems. The program monitors changes in groundwater conditions resulting from climate variability and withdrawals.