This page maintains a list of my all-time favorite authors in Fantasy and Science Fiction. I’ve divided each genre into two categories, which I loosely defined as “Top Shelf” (the very best) and “Very Good”, which I really enjoyed but not as much as the top shelf titles. Within each subcategory the lists are in no particular order.

Fantasy Top Shelf:
George R. R. Martin
Brandon Sanderson
Patrick Rothfuss
Joe Abercrombie
Scott Lynch
Jim Butcher
Lev Grossman

Fantasy Very Good: 
Stephen King
Michael J. Sullivan
Brent Weeks
Naomi Novik
R.A. Salvatore
Susanna Clarke
Piers Anthony

SciFi Top Shelf: 
Larry Niven
Fred Pohl
Isaac Asimov
Robert Heinlein
Arthur C. Clarke
Neal Stephenson
China Mieville
Jack McDevitt
Peter F. Hamilton
C.J. Cherryh
Hugh Howey
John Scalzi

SciFi Very Good:
Stephen Moss
Cixin Liu
Jack Campbell
Iain M. Banks
Claire North
Robert Charles Wilson
Piers Anthony
Robert J. Sawyer
Nathan Lowell
Ernest Cline