Leigh Douglass Brackett (December 7, 1915 – March 18, 1978) was an American author, particularly of science fiction. She was also a screenwriter, known for her work on famous films such as The Big Sleep (1945), Rio Bravo (1959), The Long Goodbye (1973) and The Empire Strikes Back (1980).
Pictured above with her husband, Edmund Hamilton.
Free SF has links to some of her free works on the web. Some appear to be teasers for complete volumes for purchase. Her work is definitely worth exploring. I came across her work in a couple of paperback collections of her short stories. I felt her Mars stories to be amazing, surpassing some of Edgar Rice Burroughs' work in their evocation of mood and loss and decay in the Martian environment. Wikipedia has a wonderful article about her unique solar system she had created to house her stories. Truly, a delightful playland of adventure worth re-exploring.
Free SF even has a link to the script for The Big Sleep, a screenplay she worked on with Jules Furthman and William Faulkner.