Edna B. Foa, PhD, is Professor of Clinical Psychology in Psychiatry at the University of Pennsylvania and Director of the Center for the Study and Treatment of Anxiety . She has published over 200 articles and book chapters as well as several books, includingTreating the Trauma of Rape(coauthored with Barbara Olasov Rothbaum). Terence M. Keane, PhD, is Professor and Vice-Chairman of Psychiatry at the Boston University School of Medicine. He is also Chief of Psychology and Director of the National Center for PTSD at the VA Boston Healthcare System. His several books and more than 130 scientific publications includeAssessing Psychological Trauma and PTSD(coedited with John P. Wilson). Matthew… J. Friedman, MD, PhD, is Executive Director of the National Center for PTSD at the White River Junction VAMC, and Professor of Psychiatry and Pharmacology at Dartmouth Medical School. He has published books and monographs on the neurobiological basis of stress, ethnocultural aspects of PTSD, the controversy surrounding recovered memories, and disaster mental health services.