She was also a screenwriter, known for her work on such films as The Big Sleep (1946), Rio Bravo (1959), The Long Goodbye (1973) and The Empire Strikes Back (1980).
Ia juga merupakan penulis naskah, wyang dikenal atas karya-karyanya seperti The Big Sleep (1946), Rio Bravo (1959), The Long Goodbye (1973) dan The Empire Strikes Back (1980).