David Stradling is the Zane L. Miller Professor of Urban History at the University of Cincinnati. He is the author of several books, including The Nature of New York: An Environmental History of the Empire State (Cornell University Press, 2010), Making Mountains: New York City and the Catskills (University of Washington Press, 2007), Smokestacks and Progressives: Environmentalists, Engineers and Air Quality in America, 1881-1951 (Johns Hopkins University Press, 1999), and, with Richard Stradling, Where the River Burned: Carl Stokes and the Struggle to Save Cleveland (Cornell University Press, 2015). He has just begun work on a global history of dredging.