Dick Shawn (born Richard Schulefand, December 1, 1923 – April 17, 1987) was an American actor. He played a wide variety of supporting roles and was a prolific character actor. During the 1960s, he played small roles in madcap comedies, usually portraying caricatures of counterculture personalities, such as the hedonistic but mother-obsessed Sylvester Marcus in It's a Mad, Mad, Mad, Mad World (1963), and the hippie actor Lorenzo Saint DuBois ("L.S.D.") in The Producers (1967). Beyond his film work, he appeared in numerous television shows from the 1960s through the 1980s. (Via Wikipedia)
