Sometimes I don’t TLDR an article, because you should read it. (-:
I’ve used his book(s) a lot. And recommend them frequently as well. I’ve not used TeX very much, but have dabbled (long ago) in LaTex, which is how most people use TeX. Now, though, I just let Word handle it.
What impresses me the most is the combination of doing amazing work but also being a humble, warm and happy person.