Check out Mania for the reasoning behind this list...
20. Tie! Mark Millar and Jim Starlin
19. Steve Englehart
18. Warren Ellis
17. Mark Waid
16. Marv Wolfman
15. Peter David
14. Kurt Busiek
13. John Byrne
12. Gardner Fox
11. Garth Ennis
10 Geoff Johns
9. Chris Claremont
8. Len Wein
7. Neil Gaiman
6. Denny O’Neil
5. Grant Morrison
4. Roy Thomas
3. Frank Miller
2. Stan Lee
1. Alan Moore