Great character actor -- via the New York Times. Instantly recognizable to my generation, Keefer racked almost 200 film and television credits between 1947 and 1997. First on stage, he played Roderigo in a revival of the Robeson/Hagen/Ferrer "Othello," and was the firstBernard in "Death of a Salesman." On film, he was in everything. He played a dcotor in "Sleeper," and in "Candy Stripe Nurses." His most indelible appearance was on the "It's a Good Life" episode of "The Twilight Zone," in which Billy Mumy turns him into a horrifying jack in the box before killing him.
http://www.hulu.com/watch/440799
