Mr. Donaldson is a member of the Tourette's Tolerance and Understanding Foundation, who appears in "Le Petit Tourette". He labels Kyle Broflovski as a bully, as he was unaware that Eric Cartman is faking his Tourette's syndrome.
As a sufferer of Tourette's himself, he has his own verbal tic - randomly saying the words "piss" and "ass" (particularly spouting things about things going in or out of his ass). He also seems very devoted to teaching others about Tourette's syndrome, even to the point of ignoring any evidence that someone would be faking it, as well as claiming that anyone who thinks otherwise is a "bully". He appears to be unintelligent and narrow-minded, as he is foolish to regard Kyle Broflovski as a so-called "bully", and to believe Eric Cartman genuinely suffered from Tourette's syndrome when he was obviously faking it.
Mr. Donaldson has short, brown hair. He wears a white shirt under a brown suit, a green tie, and dark gray pants.
- "Le Petit Tourette" - Debut
- "Eek, A Penis!" - Seen as one of the teachers watching Mr. Garrison's speech at the end of the episode.