Joan Harrison (screenwriter) the film "Jamaica Inn" (1939) based on the novel by Daphne du Maurier. When Hitchcock moved to Hollywood in March 1939 to begin his contract with David O. Selznick to direct films, Harrison went with him as an assistant and writer. She continued contributing to the screenplays for Hitchcock's films "Rebecca" (1940), also adapted from a du Maurier novel, "Foreign Correspondent" (1940), "Suspicion" (1941), and "Saboteur" (1942). She was also credited as one of the screenwriters for "Dark Waters" (1944). Harrison was an uncredited screenwriter for "Ride the Pink Horse" (1947) and "Your Witness" (1950). She became a film producer
Guy du Maurier Guy du Maurier Guy Louis Busson du Maurier DSO (18 May 1865, London, England – 9 Mar 1915, Kemmel, Flanders, Belgium) was an English army officer and playwright. He was the son of the writer George du Maurier and brother of Sylvia Llewelyn Davies and the actor Gerald du Maurier. He was educated at Marlborough and the Royal Military College, Sandhurst, and in 1885 became an officer in the Royal Fusiliers. He served in the Second Boer War, where he commanded a mounted infantry regiment, earning the Distinguished Service Order in 1902. He achieved notoriety in 1909 as the author