Ronald A. Hites, PhD, is a Distinguished Professor at Indiana University Bloomington, where he is a senior faculty member of the School of Public and Environmental Affairs. A past president of the American Society for Mass Spectrometry, Dr. Hites is an Associate Editor of thejournal of Environmental Science and Technology and a winner of the American Chemical Society's Award for Creative Advances in Environmental Science and Technology and of the Society of Environmental Toxicology and Chemistry's Founders Award.