ICEknight
From Sonic Retro
ICEknight watching Sonic 2's Tom Payne play a game
He has tracked down many of the people who worked in the old Sonic games and interviewed them for his sometimes down website Sonic Database, which also hosts many other prototype related pictures and info.
He sometimes finds little hidden things inside the games and once in a while he likes to make random hacks such as the warping effect implemented in Sonic 1, Hill Top with IceCap colors or Mecha Flicky in Sonic 2's Death Egg.