Student, Carnegie Institute of Technology; Student, American Theatre Wing, New York City.
Film appearances include Timetable, 1956, Twelve Angry Men, 1957, Cry Terror, 1958, The Scarface Mob, 1962, The Days of Wine and Roses, 1963, I Could Go on Singing, 1963, Act One, 1963, Yellow Canary, 1963, Hail Mafia, 1965, The Detective, 1968, The Split, 1968, Goodbye Columbus, 1969, Who Says I Can't Ride a Rainbow, 1971, Two Minute Warning, 1976, Dear God, 1996. Television series: Harris Against the World, 1964-1965, The Odd Couple, 1970-1975 (Emmy award 1971, 73, Golden Globe award 1974), Quincy, 1976-1983, You Again, 1986-1987. Television guest appearances include: Naked City, 1959-1963, The Twilight Zone, 1960-1963, The Untouchables, 1961-1963, The Defenders, 1962-1964 (Emmy award 1964), Ben Casey, 1962-1965, The New Breed, 1962, The Fugitive, 1963-1965, The Name of the Game, 1969-1970, Rowan & Martin's Laugh-In, 1972, The Love Boat, 1985, Brother's Keeper, 1999, Diagnosis Murder, 1999, The Outer Limits, 2000, Third Watch, 2000, Crossing Jordan, 2002, Presidio Med, 2002.Television movies: Fame is the Name of the Game, 1966, Poor Devil, 1973, The Underground Man, 1974, One of My Wives is Missing, 1976, The Odd Couple: Together Again, 1993, Parallel Lives, 1994, Twilight of the Golds, 1997. Television miniseries Around the World in 80 Days, 1989. New York stage debut in Stevedore, Equity Library Theatre, 1949.Broadway debut in Golden Boy, 1952. Other stage appearances include Gypsy, 1959, The Sudden and Accidental Re-education of Horse Johnson, 1968, I'm Not Rappaport, 1987, Three Men on a Horse, 1993, The Sunshine Boys, 1998. Author: Tony and Me: A Story of Friendship, 2005.
Member American Federation of television and Radio Artists, Screen Actors Guild, Actors Equity.
Son of Max and Rose K. Married Brett Somers, since 1966 (separated 1974). Children: Adam, David, Leslie.