Alice Bradley Sheldon (born Alice Hastings Bradley; August 24, 1915 – May 19, 1987) was an American science fiction author. She was better known by her pen name James Tiptree Jr.. She used the pen name for her books from 1967 until her death. Before 1977, most people didn't know that James Tiptree Jr. was really a woman. Sheldon was added into the Science Fiction Hall of Fame in 2012.