U.S. Geological Survey
David began working for the U.S. Geological Survey (USGS) in late 1992 and serves as a hydrologist and GIS Specialist for the USGS Lower Mississippi-Gulf Water Science Center in Nashville, TN. David has served as both a project manager of studies that focus on GIS methods and an instructor of GIS software and techniques. His current focus pertains to spatial analysis and water-balance modeling in regional studies of groundwater availability.