Mark E. HAHN, is a Senior Scientist and holds the Walter A. and Hope Noyes Smith Chair in the Biology Department at the Woods Hole Oceanographic Institution (WHOI), Woods Hole, MA, U.S.A. He received a B.S. in Biological Sciences from Harpur College of the State University of New York at Binghamton and M.S. and Ph.D. degrees in Environmental Toxicology from the University of Rochester School of Medicine and Dentistry in Rochester, NY. Dr. Hahn's research interests include receptor-mediated mechanisms of toxicity, mechanisms of adaptation and evolved resistance to chemical exposure, and the comparative biochemistry, molecular biology, and molecular evolution of the aryl hydrocarbon receptor (AHR). Recently, he and his group have begun investigating NRF2-mediated responses to oxidative stress in the zebrafish embryo model and the role of microRNAs in developmental toxicology. Dr. Hahn serves or has served on editorial boards of several journals: Toxicological Sciences (Associate Editor), Aquatic Toxicology (Associate Editor), Chemico-Biological Interactions, and Environmental Toxicology and Chemistry. He served as Director of the Pilot Project Program for the Woods Hole Center for Oceans and Human Health. Previously, he served as Chair of the Joint Committee on Biological Oceanography of the WHOI/Massachusetts Institute of Technology (MIT) Joint Graduate Program in Oceanography and Oceanographic Engineering. Dr. Hahn is author or co-author of more than 100 papers in peer-reviewed journals.