Lieutenant Colonel David Grossman is a US Army Ranger, a paratrooper, and a former West Point Psychology Professor. He has a Black Belt in Hojutsu, the martial art of the firearm, and has been inducted into the USA Martial Arts Hall of Fame. Lt. Col. Grossman has testified before the U.S. Congress and numerous state legislatures. His research was cited by the President of the United States in a national address.

He has five patents to his name, and has published four novels, two children's books, and six non-fiction books. His "perennial bestseller" On Killing sold over half a million copies sold, and he has co-authored a New York Times best-selling book with Glenn Beck.

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