Which is your all time favourite author?

Can't believe there was only 1 nod to Heinlein, nothing for Niven and obviously no fans of Slippery Jim diGriz here.

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The Dean of Science Fiction, Robert Heinlein.

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Sorry, JKRowling, I grew up with your stories and your heroine, Hermione, is my definition of good female character in fiction, but my favorite author has always been and will always be Joseph Heller. Catch-22 is a great book, full of wit and bitterness and sarcasm and I don't think there has been something with that much moral warped in that much humor. I'm glad that Yossarian lives, honestly.
 
JK Rowling
Micheal Chriction (I think I spelt his name wrong, if so oops it's been a long day)
C.S. Lewis
Piers Anthony, just to name a few.
 
The ones that popped into my head:

Rex Stout
Thomas Pynchon
Kurt Vonnegut
Agatha Christie
Herman Melville
Dashiell Hammett
Mark Twain