Happens to be this gentleman http://en.wikipedia.org/wiki/Mark_Zbikowski. Though I never worked with 'Zibbo' directly, I heard several legends of him - a lot of him centering around how he is one of the nicest people around. Which is unusual given the time at Microsoft he did a lot of his best work in.
This post is awesome , more for the folks commenting. Many times, there seems to a direct proportionality between skills and humility / niceness. Am certain Mark deserves his name to be on the executable walk of fame ( may I add, he stands more or less alone ;-)).
Channel 9 did a great interview with him a few years ago. It was a good chance for us non-Microsofties to see the man behind the MZ.