I don't have much to add to Powerline's obituary of Stuart Rosenberg, director of Cool Hand Luke. Paul Newman's performance as the title character is part of movie history. The film is also notable for its use of Christian imagery.
Stuart Rosenberg's other prison film is the underrated Brubaker (1980). Instead of being a philosophical tale about the classic anti-hero, Brubaker is truly about prison and not much else. It is based on the true story of Tom Murton, who blew the whistle on corruption and horrible conditions in the prison farms of Arkansas.
It is a testament to the late director that he could make two movies that are seemingly about the same subject, but are completely different in style, tone, and message.