PAUL F. TORRENCE, PhD, is Professor and Chair of Chemistry at Northern Arizona University in Flagstaff, and formerly Chief of the Biomedical Chemistry Section, Laboratory of Medicinal Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, and Director of the Foundation for Advanced Education in the Sciences Graduate School at the National Institutes of Health. Dr. Torrence is widely recognized for his contributions to medicinal chemistry and has published more than 190 scientific papers and patents.