James Tiptree Jr (aka Alice Sheldon) wrote superb short stories (good collestion in "Her Smoke Rose Up Forever) and a couple of interesting novels.
She wrote radical feminist fiction, but infamously famous contemporary authors and editors were convinced she was male.
A number of her stories are excellent and have stood the test of time, the best one, in my opinion, is the
Screwfly Solution - it begins with the protagonist observing a disturbing rise in misogyny and religious fundamentalism, starting in Peedsville, a small town in Texas, but spreading insidiously. To say more would be a spoiler. It is thought provoking and rather frightening story in a way. Many of her other stories are also excellent.