Character actor Karen has had a 40-year career as an actor. He made his Broadway bow with Marlon Brando in {-A Streetcar Named Desire}, directed by Elia Kazan. Since then, he has worked continuously in theater, television and film, with such greats as his idol Buster Keaton, and on up to director Oliver Stone.
His best-known films include Return of the Living Dead (1985) and Return of the Living Dead II (1988). Karen has also appeared in All the President's Men (1976), China Syndrome (1979), Poltergeist (1982), and Wall Street (1987). He was a regular on Eight is Enough (1977-81), starred in the science fiction series The Powers of Matthew Star as Major Wymore (1983) and had a recurring role on the cable series The Larry Sanders Show. ~ All Movie Guide. 