Prof. Arthur N. Popper is co-Director of the Center for Comparative and Evolutionary Biology of Hearing and Professor in the Department of Biology at The University of Maryland. Dr. Popper’s research includes understanding basic structure and function of the auditory system in fishes and other vertebrates. He has applied his research on fish bioacoustics to examine the behavioral and physiological effects of human-generated (anthropogenic) sound on fish. Over the past several years, his research group has investigated the effects on fish of seismic air-guns, sonar, increased background levels, and sounds associated with barging of fish. Most recently, his lab has been completing the first quantified studies of the effects on fishes of the very high intensity sounds produced during pile driving.