John Waldman has been a Professor of Biology at Queens College since 2004. For the previous 20 years he was employed by the Hudson River Foundation for Science and Environmental Research. His research interests focus on the ecology and evolution of fishes, the historical ecology of rivers and urban waterways, and estuarine biology. Waldman has authored more than 80 scientific articles; numerous essays in the New York Times and elsewhere; and several popular books, including the award-winning Heartbeats in the Muck: The History, Sea Life, and Environment of New York Harbor, and the recently released Running Silver: Restoring Atlantic Rivers and their Great Fish Migrations