Following wartime service in the Royal Navy, actor John Gregson built up an admirable list of theatrical credits. Signed for films by the Rank Organisation, Gregson achieved worldwide popularity as Alan McKim in the wistful comedy Genevieve (1953); though he spent virtually the entire film behind the wheel of a vintage automobile, Gregson didn't know how to drive--and so far as his co-stars were concerned, he was a very slow learner. By the end of the 1950s, Gregson had put comedy behind him to appear in a succession of military roles like Captain Bell in Pursuit of the Graf Spee (1959). On television, Gregson starred as the title character in the well-circulated Gideon CID (1966) and was co-starred as Dennis Croft on the abortive Shirley MacLaine sitcom Shirley's World (1971). John Gregson was married to actress Thea Gregory.