Born in Lincoln, California, Clark made his film debut in 1947 in The Unsuspected. His twenty year film career included almost seventy films, and numerous television appearances. As a supporting player, with his gruff voice, intimidating build, bald pate, and small moustache beneath an often scowling visage, he was cast as a testy film producer, crime boss, landlord, employer, doctor, or general.

Among his films are Ride the Pink Horse (1948), Mr. Peabody and the Mermaid (1948), Flamingo Road (1949), White Heat (1949), Sunset Boulevard (1950), A Place in the Sun (1951), How to Marry a Millionaire (1953), The Court-Martial of Billy Mitchell (1955), How to Be Very, Very Popular (1955), Auntie Mame (1958) and Visit to a Small Planet (1960). Although he continued making films during the 1960s (most notably a large role in Hammer Film Productions The Curse of the Mummy's Tomb in 1964 and John Goldfarb, Please Come Home in 1965) he was more often seen on television, with guest roles in Burns and Allen, The Beverly Hillbillies and I Dream of Jeannie among his many performances.

Clark was married to actress Benay Venuta from 1952-62, then model Gloria Glaser from 1966 until his death from liver disease in Santa Monica, California.

Clark has a star on the Hollywood Walk of Fame for his work in television, at 1713 Vine Street.

• The Unsuspected (1947)
• Ride the Pink Horse (1947)
• Mr. Peabody and the Mermaid(1948)
• Cry of the City(1948)
• Alias Nick Beal (1949)
• Flamingo Road(1949)
• Task Force(1949)
• White Heat(1949)
• Sunset Boulevard(1950)
• The Jackpot (1950)
• The Lemon Drop Kid(1951)
• A Place in the Sun (1951)
• Three for Bedroom "C"(1952)
• Dreamboat (1952)
• The Caddy (1953)
• How to Marry a Millionaire(1953)
• Living It Up(1954)
• Abbott and Costello Meet the Keystone Kops (1955)
• Daddy Long Legs(1955)
• The Court-Martial of Billy Mitchell (1955)
• How to Be Very, Very Popular(1955)
• Miracle in the Rain(1956)
• The Birds and the Bees(1956)
• The Solid Gold Cadillac(1956)
• Back from Eternity(1956)
• The Fuzzy Pink Nightgown(1957)
• Don't Go Near the Water(1957)
• Auntie Mame(1958)
• The Mating Game (1959)
• It Started with a Kiss (1959)
• Risate di gioia(1960)
• Visit to a Small Planet(1960)
• Bells Are Ringing(1960)
• Boys' Night Out(1962)
• Zotz!(1962)
• Move Over, Darling(1963)
• The Curse of the Mummy's Tomb (1964)
• John Goldfarb, Please Come Home (1965)
• Dr. Goldfoot and the Bikini Machine (1965)
• Skidoo(1968)
• The Horse in the Gray Flannel Suit (1968)

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