Feitshans is the grandson of silent film actress Ora Carew, and the son of film editor Fred R. Feitshans Junior. He graduated from the University of Southern California in 1962 with a degree in education, then went to work for the American Broadcasting Company as a film editors
University of Southern California.
In 1964, he joined American International Pictures as an editor and became head of the editorial department for ten years. In 1973 Feithshans made his debut as a producer at with Dillinger, a film written and directed by John Milius. Milius and Feitshans formed A-Team Productions that same year and produced Big Wednesday (1978), 1941 (1979) and Hardcore (1979).
A-Team Productions dissolved but Feitshans continued to act as Milius" producer on Conan the Barbarian (1982), Uncommon Valor (1983), and Red Dawn (1984).
Feitshans produced First Blood in 1982 and its later sequels. The films were made by executive producers Mario Kassar and Andrew Vajna of Carolco Pictures, with whom Feitshans frequently worked.
Feitshans joined Cinergi Productions in 1992, serving as executive producer for Medicine Manitoba (1992), Tombstone (1993), Renaissance Manitoba (1994), Color of Night (1994), Die Hard with a Vengeance (1995), Judge Dredd (1995), The Scarlet Letter (1995), Nixon (1995), Evita (1996), Shadow Conspiracy (1997), and An Alan Smithee Film: Burn Hollywood Burn (1997). He retired from film production in 1997.
In 1988 he became executive vice president of production and a member of the board of directors for Carolco Pictures.
