Robert Fields has consistently been a stage actor with a more extensive career than his film appearances, yet he has still managed to make a notable impact in various theatrical and made-for-television productions. His acting journey began in 1958 when he was selected for the role of Tony, one of the teenagers in the independently produced sci-fi/horror film The Blob, which was being shot in Pennsylvania.
Fields was a close friend of Steve McQueen, who starred in the film, and their scenes together had a remarkable chemistry that made them one of the most effective parts of the movie, which has since developed a cult following. Fields took a decade-long hiatus from films but continued to work extensively in theater, including a notable performance in Marat/Sade on Broadway.
He next appeared on screen in The Incident, a tense drama that explores the story of a group of people who are victimized by a pair of thugs on a New York City subway. Following a small role in the classic film They Shoot Horses, Don't They?, he co-starred with Sondra Locke in the film Cover Me Babe.
In 1973, Fields played the role of an assistant district attorney in The Marcus-Nelson Murders, which was one of the most-watched made-for-television features of the decade. He also made a cameo appearance in Looking for Mr. Goodbar and played major roles in international productions such as Jet Lag and Bob Fosse's Star 80.
However, it was his performance as the male lead in the film Anna, directed by Yurek Bogayevicz and starring Sally Kirkland, that has been one of his most visible big-screen successes to date.