Joe Ayotte is a supervisory hydrologist with the U.S. Geological Survey in Pembroke, NH. He presently coordinates multidisciplinary studies involving groundwater quality at the USGS New Hampshire - Vermont Office of the New England Water Science Center. Most recently, he has worked on national and regional studies of trace elements (primarily arsenic) in groundwater and has worked closely with the National Institutes of Health, National Cancer Institute and the Centers for Disease Control and Prevention on arsenic in drinking water supplies. He received his B.S. in Hydrology from the University of New Hampshire. He joined the USGS in 1987 and has been involved in many studies of groundwater and surface water resources in New England and the U.S.