Joel A. Tarr is Richard S. Caliguiri University Professor of History and Policy at Carnegie Mellon University. He is the recipient of the Leonardo da Vinci Medal from the Society for the History of Technology and the Distinguished Service Award from the American Society for Environmental History. He is the author, coauthor, or coeditor of several books, including Technology and the Rise of the Networked City in Europe and America, which won the Abel Wolman Prize, and Devastation and Renewal: An Environmental History of Pittsburgh and Its Region. He has served as president of the Public Works Historical Society and the Urban History Association. He has also served on National Research Council committees dealing with issues of urban infrastructure, public transit, water pollution, and the human dimensions of global change.