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