John Waldman is professor of biology at Queens College, City University of New York. Prior to this appointment in 2004, he was employed for 20 years by the Hudson River Foundation for Science and Environmental Research. His research interests focus on the ecology and evolution of fishes, particularly diadromous forms, urban aquatic environments, and historical ecology. He also is author of several popular books, including Heartbeats in the Muck: The History, Sea Life, and Environment of New York Harbor. He received his Ph.D. in 1986 from the Joint Program in Evolutionary Biology between the American Museum of Natural History and the City University of New York.