Raimo Pohjanvirta, PhD, is Professor of Toxicology at the University of Helsinki. He has been studying the effects and action mechanisms of dioxins for over twenty years, publishing over a hundred peer-reviewed papers on dioxins and AHR. Dr. Pohjanvirta has been an invited lecturer at major international conferences, including the Society of Toxicology, EUROTOX, and the British Toxicology Society.