Frank Dux

Frank William Dux ( ; born April 6, 1956) is a Canadian-American martial artist and fight choreographer. According to Dux, a ninjutsu expert named Senzo Tanaka trained him as a ninja when he was a teenager. He established his own school of ninjutsu called Dux Ryu Ninjutsu, and has said he won a secret martial arts tournament called the Kumite in 1975. His alleged victory served as the inspiration for the 1988 film Bloodsport starring Jean-Claude Van Damme, but the existence of both Senzo Tanaka and the Kumite he described have been disputed.

Dux served in the United States Marine Corps Reserve from 1975 to 1981, and claims he was sent on covert missions to Southeast Asia and awarded the Medal of Honor. He also asserts he was recruited by Central Intelligence Agency (CIA) director William J. Casey to work as a covert agent. His military records, however, show he was never sent overseas nor received any awards; Dux states the military sabotaged his records to discredit him. He has been accused of falsifying his military service by authors Bernard Burkett, Ralph Keyes, and Nigel West, and his claim to have worked for the CIA has been dismissed by Director of Central Intelligence Robert Gates, General Norman Schwarzkopf Jr., Major General John K. Singlaub, and Soldier of Fortune magazine.

Dux worked as a fight choreographer for Bloodsport (1988), Lionheart (1990), and Only the Strong (1993). He detailed his alleged work for the CIA in the book The Secret Man in 1996, and that same year co-wrote the story for the film The Quest alongside Jean-Claude Van Damme. He sued Van Damme for breach of contract over the film, but lost the suit in 1998. He also lost a lawsuit against Soldier of Fortune for libel the following year, over their claims he had falsified his military and CIA service.