Dr. Halden is an expert in analyzing pollutants in water, determining their source, and estimating their health risks. In his research, Dr. Halden uses a variety of advanced methods for sampling and analysis of organic and inorganic pollutants, along with mass balance calculations, to track pollutants from their point of release to a given receptor. He served on the Maryland State Water Quality Advisory Committee from 2003 to 2005 and was an invited delegate to the Congress on Emerging Contaminants held in Washington, D.C., in 2005. Dr. Halden received an M.S. degree in biology from the Technical University, Braunschweig, Germany, and M.S. and Ph.D. degrees in civil engineering from the University of Minnesota.