Marc Edwards, a civil engineer, is playing a vital role in ensuring the safety of drinking water and in exposing deteriorating water-delivery infrastructure in America’s largest cities. An expert in the chemistry and toxicity of urban water supplies in the United States, he has made significant advancements in a broad array of areas, including arsenic removal, coagulation of natural organic material, and the causes and control of copper and lead corrosion in new and aging distribution systems. Marc Edwards received a B.S. (1986) from the State University of New York at Buffalo and an M.S. (1988) and Ph.D. (1991) from the University of Washington in Seattle. Since 1997, he has been affiliated with Virginia Polytechnic Institute and State University, where he is currently the Charles P. Lunsford Professor of Civil and Environmental Engineering. He taught previously at the University of Colorado at Boulder.