[qmalxp]

It's probably worth pointing out that Good Educator != Good Author. I have heard from people who would know that your guess is not so far off, but having taken classes from him I can attest he is an excellent teacher in addition to being a world class mathematician.

I also want to add that although he is extremely friendly and helpful, it'd be dishonest to say he isn't a bit weird. However, that is probably just an ingredient/consequence of greatness; I reckon most of the big name tech founders discussed on these forums are a bit weird.

[javert]

How is he weird? Just curious.

[overpaidgoogler]

Not in any specific way, but he has a nerdy demeanor. There are many interviews of him online your can watch.