Mandel began working regularly for television in the mid-1960s; over the years he has composed for many TV-movies ("The Trackers" 1971; "Single Women, Married Men" (1989), pilots ("Guilty or Not Guilty" 1966; "Call Holme" 1972) and specials. He has also written music for series including "Jack and Mike" and "Too Close for Comfort". Mandel received Emmy nominations for musical scoring three years in a row for his work on "A Letter to Three Wives" (1985/86), "LBJ: The Early Years" (1986/87) and "Foxfire" (1987/88). Probably his best-remembered work on TV was for the long-running CBS series "M*A*S*H", especially his adaptation of the haunting theme song, "Suicide Is Painless", which he originally wrote for Robert Altman's 1970 feature film of the same name.