"James Tiptree, Jr., burst onto the science fiction scene in the late 1960's with a string of hard-edged, provocative stories. He redefined the genre with such classics as "Houston, Houston, Do You Read?" and "The Women Men Don't See." He was hailed as a brilliant writer with a deep sympathy for his female characters.
For nearly ten years he carried on intimate correspondences with other writers–Phillip K. Dick, Harlan Ellison, and Ursula K. Le Guin, to name a few. None of them knew his true identity. He was so reclusive he was widely believed to be a top-secret government agent. Then the cover was blown on his alter ego: a mysterious sixty-one year-old woman named Alice Bradley Sheldon." – Julie Phillips, James Tiptree, Jr. The Double Life of ALICE B. SHELDON
For National Public Radio article on Alice B. Sheldon go to this link