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Here is a list of the all-time best SF authors, according to Locus Magazine...

ALL-TIME BEST SF AUTHOR

1. Philip K. Dick
2. Arthur C. Clarke
3. J. G. Ballard
4. Isaac Asimov
5. Robert A. Heinlein
6. Brian Aldiss
7. Frank Herbert
8. Larry Niven
9. Robert Silverberg
10. Ursula K. Le Guin
11. Gene Wolfe
12. * Harlan Ellison
12. * Michael Moorcock
14. * Ray Bradbury
14. * Harry Harrison
14. * Bob Shaw
17. * David Brin
17. * H. G. Wells
19. William Gibson
20. * C. J. Cherryh
20. * Roger Zelazny
22. * Douglas Adams
22. * Stephen R. Donaldson
24. Samuel R. Delany
25. * Alfred Bester
25. * Christopher Priest
25. * Keith Roberts
28. * John Brunner
28. * Alan Dean Foster
28. * Terry Pratchett
28. * Jack Vance
32. Richard Cowper
33. Clifford D. Simak
34. * Joanna Russ
34. * Kurt Vonnegut
36. * Robert Sheckley
36. * J. R. R. Tolkien
38. * Michael Coney
38. * John Crowley
38. * James Tiptree, Jr.
41. * Fredric Brown
41. * Orson Scott Card
41. * Ian Watson
44. * Barrington Bayley
44. * Joe Haldeman
44. * Charles L. Harness
44. * Lucius Shepard
44. * Cordwainer Smith

Personally, I think Neal Stephenson should be added to the list - but I guess he is still a newcomer, relative to the others!