As the article here states, he was a BTC early adopter, so I would think his portfolio is one of the bigger ones in the world in some regards.
If he ONLY held BTC and nothing else seeing as his early adoption and his teaching skills would allude to -- and BTC is the one coin worth the most at $2600 USD or so today, then yes.
I would think he is worth quite a bit. Even if just on paper but he is sharp, knows what to do with money clearly.