
John Karlen (born John Adam Karlewicz) was an American character actor who played multiple roles (Willie Loomis, Carl Collins, William H. Loomis, Desmond Collins, Alex Jenkins, and Kendrick Young) on the ABC serial Dark Shadows, in various episodes which aired from 1966 to 1971. Karlen also played Harvey Lacey, husband of Mary Beth Lacey (played by Tyne Daly), on the CBS crime series Cagney & Lacey (1982–88).

The Waltons
TV • 1972

Murder, She Wrote
TV • 1984

Murder, She Wrote
TV • 1984

Murder, She Wrote
TV • 1984

Mannix
TV • 1967

Hawaii Five-O
TV • 1968

Quincy, M.E.
TV • 1976

Quincy, M.E.
TV • 1976

Charlie's Angels
TV • 1976

Hill Street Blues
TV • 1981

The Rockford Files
TV • 1974

Cagney & Lacey
TV • 1982

Mad About You
TV • 1992

Starsky & Hutch
TV • 1975

Naked City
TV • 1958

The Hardy Boys / Nancy Drew Mysteries
TV • 1977

Vega$
TV • 1978

Barnaby Jones
TV • 1973