Just came over this thread;
Concerning emulator authors, i would choose: Steve Snake, his Kega emulator is FANTASTIC, great attention to details he has.
And about DOS and assembly games programmers, there is one, Michael Abrash, one of the greatest game programmers. (the fact that he influenced a lot of other know and great programmers, including John Cramack)
And best programmer all categories : Dave Cutler, Win NT kernel programmer.