Spoiler:Hmmm...
1.
2.
3. Sid Meier
4.
5.
6. Bruce Shelley
7. John Carmack
8.
9. Warren Spector
10. Richard Garriot
11.
12. Peter Molyneux
13.
14. Will Wright
15. Roberta Williams
16. Hal Barwood
17. Tim Schafer
18. Larry Holland
19. Bill Roper? (probably not)
20.
21. Ron Gilbert
22.
23.
24. Gabe Newell
25.
This is hard! I'm very curious about the ones I didn't got. Any hi-res scans?