Jack Thibeau (born June 12, 1946) is an American film and television actor best known for playing the prisoner Clarence Anglin in the 1979 film Escape from Alcatraz. During his career, he frequently appeared in other movies that starred Clint Eastwood, such as Any Which Way You Can (1980), Sudden Impact (1983), and City Heat (1984). Thibeau also played a number of characters in such films as 48 ...