Inside the Mind of the Active Shooter

Knowing your adversary is the first step to stopping your school’s worst enemy

Mark Siegert, PhD is a Clinical and Forensic Psychologist and a principal in Threat Assessment Experts ( He is a former faculty member at Harvard University, Harvard Medical School and Columbia University. He will be presenting his work on “Direct, Indirect and Perceived Threats: Challenges posed by the American’s with Disabilities Act (ADA)” at the Association of Threat Assessment Professionals (ATAP) 23rd Annual Threat Management Conference on Aug. 14, in Anaheim, Calif. His decades of experience in Forensic Psychology ( include extensive evaluations of violent perpetrators, Violence Risk Assessment and Fitness-for-Duty Examinations for employees, students and defendants. His expertise has led him to be interviewed on The O’Reilly Factor, Connie Chung, Paula Zahn, Crossfire, and NPR.


Beth Siegert, M.S., is an organizational psychologist and consultant, and a principal in Threat Assessment Experts ( She has expertise facilitating a team’s focus and collaboration with threat assessment professionals, private security, law enforcement, HR, Executives and Administration, and other professionals. She is a seasoned leader and team developer with more than 25 years experience.