Matthew K. Nock, PhD, is the John L. Loeb Associate Professor of the Social Sciences and director of the Laboratory for Clinical and Developmental Research in the Department of Psychology at Harvard University in Cambridge, Massachusetts. Dr. Nock received his doctorate in psychology from Yale University and completed his clinical internship at the New York University Child Study Center-Bellevue Hospital Center. His research focuses primarily on the etiology, assessment, and treatment of nonsuicidal self-injury, suicidal behaviors, and aggressive behaviors. Dr. Nock has authored more than 75 scientific articles on these topics, and his research is funded by the National Institute of Mental Health, the American Foundation for Suicide Prevention, and the Talley and Clark Funds at Harvard University. In addition to his research and clinical work, Dr. Nock teaches courses at Harvard on self-destructive behaviors, statistics, research methodology, developmental psychopathology, and cultural diversity.