John Dean "Jeff" Cooper (10 May 1920 - 25 September 2006) was recognized as the father of what is commonly known as "The Modern Technique" of handgun shooting, and was considered by many to be the world's foremost expert on the use and history of small arms.

Born John Dean Cooper, but known to his friends as "Jeff", Cooper was a former Marine Lt. Colonel who served in World War II and in Southeast Asia during the Korean War. In addition to his expertise in firearms, he was a history professor, philosopher, adventurer, and author. He was also known as "the Guru"

In 1976, Cooper founded the American Pistol Institute (API, later "Gunsite" when Cooper began teaching shotgun and rifle classes) in Paulden, Arizona to train law enforcement and military personnel, as well as law-abiding civilians. He sold the firm in 1989 but continued living on the ranch. He was well-known for his cogent and thoroughly-researched advocacy of large caliber handguns for personal defense, especially the 1911 Colt.

Cooper died peacefully at his home on the afternoon of Monday, September 25, 2006.

We extend our sincere and heartfelt sympathies to his wife Janelle and daughters Christy, Parry & Lindy.

..proud to have been your students, thank you Jeff...