Answer:
In a 2004 interview with Terry Gross, he claims to have been "analyzed" as a Tuerette's and Asperger's kid. There is still some speculation about if it was true or not. It was a radio interview so no one could see his facial expression but when asked, he said he was not joking. I personally find it hard to believe that if that were true, why is he not more of an activist for autism?