Dr. Bruce S. McEwen is Alfred E. Mirsky Professor and head of the Harold and Margaret Milliken Hatch Laboratory of Neuroendocrinology at The Rockefeller University. Dr. McEwen received his A.B. from Oberlin in chemistry, summa cum laude, his Ph.D. from Rockefeller in cell biology and completed a postdoctoral fellowship at the Institute of Neurobiology in Goteborg, Sweden. Past president of the International Society of Neuroendocrinology, Bruce is currently president of the Society for Neuroscience and a fellow of the American Academy of Arts and Sciences. The author of numerous peer-reviewed articles and the co-author of The Hostage Brain (1994), the studies by Dr. McEwen and his research team continue to elucidate the impact of stress on brain structure and neurochemistry as well as to define sex differences in the brain.