Leslie Norman was a British film director associated with Hammer Film Productions. His only work in the horror genre was the 1956 science fiction film X the Unknown. Originally, X the Unknown was to be directed by Joseph Walton (real name Joseph Losey). However, actor Dean Jagger refused to work with Walton, believing him to be a communist sympathizer. Walton was eventually replaced with Leslie Norman. Illness was cited as Walton's official reason for leaving the production. 
Leslie Norman passed away from heart failure in London, England on February 18th, 1993.