My Nominees:
BrienJ: This guy is one of the greats of gamesave hacking. This guy has been 1 of (3-4) people with the knowledge to calculate Auth Key's required to save games which is a great feat. He also has put a great effort into helping with forum moderation and research at the XBOX-Saves.com forum.. Definately a good choice
even though he passed on the opportunity.
Roofus: Again, another with the sacred knowledge of finding Auth Keys. A very talented programmer and has done his rounds of the Game Hacking scene. I'm sure everyone's heard of him by now.
SniperKil: All around good guy and knows how to get shit taken care of. If someone's getting out of hand, He'll take care of it.

Very knowledgable as well.