Dr. Peter Langman is a psychologist whose research on school shooters has received international recognition. He has spoken at the FBI National Academy in Quantico, the National Counterterrorism Center, and dozens of organizations and school districts around the country. He is a researcher with the National Threat Assessment Center of the United States Secret Service. His work has been cited in congressional testimony on Capitol Hill and his recommendations on school safety were presented to President Barack Obama by the CEO of the American Psychological Association. He is the author of Warning Signs: Identifying School Shooters Before They Strike and Why Kids Kill: Inside the Minds of School Shooters.