Born and raised in San Francisco, California, he was educated at that city's Lowell High School. Soon after the December 7, 1941 attack on Pearl Harbor, he served a stint in the United States Army Air Corps during World War II.
Repp appeared on Rod Cameron's State Trooper, Barbara Eden's How to Marry a Millionaire, Peter Lawford's The Thin Man (1957), Tom Tryon's Texas John Slaughter (1958), Rex Allen's Frontier Doctor (1959), Rawhide (1959), Howard Duff's Dante (1961), Walter Brennan's The Real McCoys (1957 and 1959), The Donna Reed Show (1960), Guestward, Ho! (1960), Angel (1961), and Dennis the Menace (1962 and 1963). He appeared as Joe Melvin, a plumber, in the 1963 episode of The Lucy Show, "Lucy and Viv Put in a Shower".
At the beginning of his acting career, Repp appeared in numerous film and TV productions including the films I Want to Live! with Susan Hayward, and The Brothers Karamazov, both made in 1958. Also at this same time he began to appear in a string of early television programs from the middle 1950s to the early 1960s, including NBC's western anthology series Frontier and the Barry Sullivan/Clu Gulager western, The Tall Man.
Repp made four appearances on Perry Mason between 1959-1962 in minor roles, including Private Investigator Phillip Morgan in "The Case of the Petulant Partner."
From 1963 to 1964, he portrayed Brink, the factory supervisor on Phil Silvers' The New Phil Silvers Show. His series co-stars were Buddy Lester, Herbie Faye, Elena Verdugo, Ronnie Dapo, and Sandy Descher.
In early 1966, he appeared as a railroad detective in an episode in the last season of My Favorite Martian.
After Batman was cancelled in 1968, he wisely invested his money with a partnership in a chain of car washes, which brought him considerable financial success.
His last released film was Cycle Psycho in 1973. He had a posthumous appearance in Mannix that was first broadcast two months after his death. His last television appearance was on the TV show M*A*S*H (as a Military Police Officer) that was first broadcast four months after his death. Shortly before his death in 1974 he filmed several scenes in Orson Welles' unfinished film The Other Side of the Wind.
Repp suffered a fatal heart attack at the age of 56 on November 5, 1974, while at the Hollywood Park Racetrack. He is interred at Westminster Memorial Park in Westminster, California. After his death, his sister, a television Writer, established the Stafford Repp Memorial Scholarship for alumni of his alma mater, Lowell High School.
