Terrence Tao is teaching on prime numbers. 

He is a child prodigy that is now 31 and teaching at UCLA.

Here is a little quote from the article:

In English classes, for instance, he became flustered when he had to write essays.

“I never really got the hang of that,” he said. “These very vague, undefined questions. I always liked situations where there were very clear rules of what to do.”

Assigned to write a story about what was going on at home, Terry went from room to room and made detailed lists of the contents.