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Sounds like Phillips has written a terrific bio - and I argue that anyone capable of producing even ONE of Tiptree's most intense stories is not just "nearly great". I hope this book sends a lot of readers back to the greatest of his/her stories (many named in Miller's article). Thank you Laura - Julie - and Alice.
Tiptree/Sheldon's name lives on in an annual award for science fiction and fantasy that "explores and expands gender"; see tiptree.org for details. S/he also dissected imperialism and colonialism with a laser beam.
Even Tiptree's less-than-earthshattering stories are still terrific reads; my own guilty pleasure is "Faithful to thee, Terra, in our fashion" but I hope you'll have your own.