Lucio G. Costa, Ph.D., is professor of environmental health and toxicology at the University of Washington School of Public Health and Community Medicine. He is also director of the NIEHS-sponsored Neurotoxicology Research Core at the Center in Ecogenetics and Environmental Health. His research is focused on the study of the cellular, biochemical and molecular mechanisms involved in neurotoxicity using biochemical, molecular and imaging techniques. David L. Eaton is Professor of Environmental Health and Associate Dean for Research in the School of Public Health and Community Medicine at the University of Washington. He serves as Director of the Center for Ecogenetics and Environmental Health, and is also Deputy Director for a major NIEHS-sponsored research initiative in the area of toxicogenomics. Dr. Eaton”s research interests focus on understanding how subtle genetic differences between individuals and species can result in potentially large differences in susceptibility to chemical carcinogens.