Nic was tutoring me in proof-based foundational maths when I worked as a research engineer and I have nothing but praise for him and his tutoring service. He created a hyper personalized syllabus and was able to focus in on the areas in which my understanding was shaky incredibly quickly. I only studied very foundational concepts with him, but you can glean from the articles on his website how far and wide his knowledge extends.
It feels very rare that someone with his level of intellectual depth is this interested in teaching others.
Nic was a colleague of mine when we were both at Google Brain and he has a rare combination of both desire and ability to really understand the fundamentals of a field. (That is especially rare in ML, haha.) He also has a knack for explaining these things clearly --- cutting away the cruft and getting to the heart of the matter. I can't recommend working with / learning from him enough!
It feels very rare that someone with his level of intellectual depth is this interested in teaching others.
(Hi Nic! \o/)