And we know he was a great teacher because this article says so?
He may or may not have been a good teacher, but the article is so obviously biased, it can't be trusted. He is presumably a left-wing political operator, since it says he founded a branch of Amnesty International at the school, and I regret to say that that organization has become strongly anti-American.
We have enough left-wing politicization in the schools. Most students are never exposed to anything else. I wonder what kind of "philosophy" he teaches? Aristotle or Marx?
That's a tough one 8-)