Fields' career as a film editor commenced in 1960, when the director Irving Lerner recruited her to be the editor of the film Studs Lonigan; Fields and Lerner had both worked on The Savage Eye.
In 1971 Peter Bogdanovich, with whom Fields had worked on Targets, recruited her to edit What's Up, Doc? (1972); Bogdanovich had edited his previous films himself [REF].