David Shaffer, M.D., is the Irving Philips Professor of Child Psychiatry & Professor of Psychiatry & Pediatrics at The College of Physicians & Surgeons, Columbia University. He is the Chief of the Division of Child & Adolescent Psychiatry at Columbia University Medical Center. Dr. Shaffer, a recipient of the 2006 Brain & Behavior Research Foundation Ruane Prize for Outstanding Achievement in Child & Adolescent Psychiatric Research & a 1992 NARSAD Distinguished Investigator Grantee, is a pioneer in the study of suicide & was the lead investigator in developing the Children’s Global Assessment Scale (C-GAS). He has led a team of colleagues & investigators in developing & modifying the Diagnostic Interview Schedule for Children (DISC) & the Columbia Teen Screen.