An early success was in the title role of radio's That Brewster Boy, While doing that program, he also was an undergraduate student at Northwestern University. He left the show in 1943, during World War II, to join the United States Marine Corps where he was commissioned reaching the rank of Captain. He remained in the Marine Corps Reserve from 1942-1957. At the time, he was billed as Eddie Firestone Jr.
Some of the first television appearances with Eddie Firestone was in the first season of Jack Webb's Dragnet (1951-52). He guest starred in, "The Big Lamp" in season 1 Episode 14 on Dragnet. Firestone appeared in several roles on the popular Western television series Bonanza, Hogan's Heroes, as well as in Walt Disney's feature film The Great Locomotive Chase. He also appeared on Perry Mason in the 1962 episode, "The Case of the "Dodging Domino," the 1963 episode, "The Case of the Decadent Dean," and the 1964 episode, "The Case of the Place Called Midnight."
He guest-starred in "Prosecutor", the premiere episode of The Silent Force, in 1970. In 1976, he starred in a Rockford Files episode, "Feeding Frenzy." He also appeared in an episode of Knight Rider titled "Slammin' Sammy's Stunt Show Spectacular" in 1982, playing the character of Sammy Phillips. He also played the part of the character "Stumbles" in the 1969 episode "The Joker is Wild, Man, Wild" on Hawaii Five-O.
