David Spiegel, M.D., is the Willson Professor in the School of Medicine and Associate Chair of Psychiatry and Behavioral Sciences at the Stanford University School of Medicine. He collaborated in the inclusion of Acute Stress Disorder, a new psychiatric diagnosis in the Diagnostic Statistical Manual, Fourth Edition (DSM-IV), and chaired the work group on Dissociative Disorders. Among his more than 400 scientific journal articles and chapters and 10 books, he is the editor of Dissociation: Culture, Mind and Body (American Psychiatric Press, 1994), and co-editor of Traumatic Dissociation (American Psychiatric Publishing, 2007). His research on the health effects of psychosocial support was the subject of a segment on Bill Moyers' Emmy Award–winning special Healing and the Mind. He is Past-President of the American College of Psychiatrists and the Society for Clinical and Experimental Hypnosis.