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 About the Colonel

Lt. Col. Dave Grossman is an internationally recognized scholar, author, soldier, and speaker who is one of the world’s foremost experts in the field of human aggression and the roots of violence and violent crime.  


Col. Grossman is a former West Point psychology professor, Professor of Military Science, and an Army Ranger who has combined his experiences to become the founder of a new field of scientific endeavor, which has been termed “killology.”  In this new field Col. Grossman has made revolutionary new contributions to our understanding of killing in war, the psychological costs of war, the root causes of the current "virus" of violent crime that is raging around the world, and the process of healing the victims of violence, in war and peace.  

Lt. Col. David Grossman is the author or co-author of five non-fiction and four fiction books.  He has co-authored a New York Times bestselling book with Glenn Beck.  His book On Killing has sold over a half million copies world-wide, has been translated into five languages, is on the US Marine Corps Commandant’s Required Reading List, and is required reading at the FBI academy and numerous other academies and colleges.  Col. Grossman co-authored Stop Teaching Our Kids to Kill:  A Call to Action Against TV, Movie and Video Game Violence, which has been translated into Norwegian and German, and has received international acclaim.   Col. Grossman’s next book was On Combat, which has also placed on the US Marine Corps Commandant’s Required Reading List and is translated into Chinese, Japanese, and Korean.  His book Warrior Mindset, applies sport psychology and performance psychology to military and law enforcement, and his most recent book is Assassination Generation.


Col. Grossman has written 23 book chapters, and 35 book forwards.  He has been called upon to write the entry on “Aggression and Violence” in the Oxford Companion to American Military History, three entries in the Academic Press Encyclopedia of Violence, and he has authored or co-authored 43 articles in journals and Periodicals, to include the Harvard Journal of Law & Public Policy, and Pediatric Annals.


He has presented papers before the national conventions of the American Medical Association, the American Psychiatric Association, the American Psychological Association, and the American Academy of Pediatrics.  


He has presented to over 100 different colleges and universities world wide, and he has trained educators and law enforcement professionals, at the federal, state and regional level, in all 50 states and over a dozen foreign nations.

He helped train mental health professionals after the Jonesboro school massacre, and he was also involved in counseling or court cases in the aftermath of the Paducah, Springfield, Littleton, Virginia Tech, and Nickel Mines, PA Amish school massacre.  In February, 2018, after the Parkland, FL school massacre, Col. Grossman was called to the White House to serve on President Trump’s Round Table on Violent Video Games.


He has been an expert witness and consultant in state and Federal courts, to include serving on the prosecution team in UNITED STATES vs. TIMOTHY MCVEIGH.  

He has testified before U.S. Senate and Congressional committees on three different occasions, he has testified before numerous state legislatures, and he and his research have been cited in a national address by the President of the United States.  

Col. Grossman is an Airborne Ranger infantry officer, and a prior-service sergeant and paratrooper, with a total of over 23 years experience in leading U.S. soldiers worldwide.  He retired from the Army in February 1998 and has devoted himself full-time to teaching, writing, speaking, and research.

Today Col. Grossman is the director of Grossman On Truth, LLC (  In the wake of the 9/11 terrorist attacks, he has written and spoken extensively on the terrorist threat, with articles published in the Harvard Journal of Law and Civil Policy and many leading law enforcement journals, and he has been inducted as a “Life Diplomate” by the American Board for Certification in Homeland Security, and a “Life Member” of the American College of Forensic Examiners Institute.

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