Well, you could be right, but he sure fits the diagnostic criteria. Very much like Mr.Spock from Star Trek, minus the ears. Never raised his voice, never showed much enthusiasm for things, just wanted to be alone with his books, poor communication skills, few friends, no interests outside of work. Not interested in anything recreational, just kept wanting to get back to work. I've never seen anyone so introverted in my life. Like pulling teeth to get any emotion out of him.