Kwitney was born in New York City. She graduated from Wesleyan University with a Bachelor of Arts in English and from Columbia University's Master of Fine Arts Fiction Writing Program. Kwitney was also an editor for Vertigo, the mature/dark fantasy branch of DC Comics. Harper-Collins published her first novel, Till The Fat Lady Sings, in 1991. This was also her master's thesis.
Kwitney lives on the Upper West Side of Manhattan. She is the daughter of science fiction author Robert Sheckley.
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