Cutler himself wrote code for Vista/Longhorn though. I don't know what you mean by "supervising" it. He also led the efforts for "PatchGuard" kernel protection mechanism that was introduced with Vista.

Source: I reviewed Cutler's lock-free data structure changes in Vista/Longhorn to find bugs in them, failed to find any.

AH, I was repeating something I read elsewhere, but I'll defer to an eyewitness. Must've been pretty cool working on Windows back then. Maybe it was more varied than my line of work. I must escape the drudgery B2B SaaS Webcrapps.