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
Alfred Hitchcock Selznick picture "Rebecca" (1940) was Hitchcock's first American film, set in a Hollywood version of England's Cornwall and based on a novel by English novelist Daphne du Maurier. The film stars Laurence Olivier and Joan Fontaine. The story concerns a naïve (and unnamed) young woman who marries a widowed aristocrat. She goes to live in his huge English country house, and struggles with the lingering reputation of his elegant and worldly first wife Rebecca, who died under mysterious circumstances. The film won Best Picture at the 13th Academy Awards; the statuette was given to Selznick, as the film's producer. Hitchcock