Leonard Boyarsky, lead world artist on Blizzard's just-annouced Diablo III, is a veteran RPG developer.
He was one of the original leads on Black Isle Studios' Fallout, and contributed to Fallout II. Before that title's release, he co-founded Troika Games with fellow Fallout creators Tim Cain and Jason Anderson; the trio designed Arcanum: Of Steamworks & Magick Obscura and Boyarsky led Vampire: The Masquerade - Bloodlines.
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Source: Gamasutra