He is? Working in CSAIL for years, I would never have guessed that he was autistic. The email threads are lost to me now, but I remember him being unyielding and obnoxiously dedicated to free software, but he never seemed unaware of social cues. He always struck me as a very good communicator - someone who understood exactly how obnoxious he was, he was just a true believer so he didn't really care.