Feitshans 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 editor.
In 1964, he joined American International Pictures as an editor and became head of the editorial department for ten years.
A-Team Productions dissolved, but Feitshans continued to act as Milius' producer on Conan the Barbarian (1982), Uncommon Valor (1983), and Red Dawn (1984).
The films were made by executive producers Mario Kassar and Andrew Vajna of Carolco Pictures, whom Feitshans frequently worked with.
Feitshans joined Cinergi Productions in 1992, serving as executive producer for Medicine Man (1992), Tombstone (1993), Renaissance Man (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).