James Tiptree, Jr.

Alice Bradley Sheldon was an American science fiction author better known as James Tiptree Jr., a pen name she used from 1967 to her death. She was most notable for breaking down the barriers between writing perceived as inherently male or femaleit was not publicly known until 1977 that James Tiptree Jr. was a woman. From 1974 to 1977 she also used the pen name Raccoona Sheldon.

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Source: Wikipedia