Dawn Langley Pepita Simmons (15 October 1937,[1] or unknown date in 1922, depending on source[2][3][4] – 18 September 2000) was a prolific English author and biographer.[3] Born "Gordon Langley Hall", Simmons lived her first decades as a male. As a young adult, she became close to British actress Margaret Rutherford, whom she considered an adoptive mother and who was the subject of a biography Simmons wrote in later years.