Martin's writing and explanation style is truly awesome! I read his book DDIA (Designing data intensive applications) and listened to his distributed systems class lectures [1]. It was a joy learning. I wish I had him or someone like him in graduate school. I would've probably taken all his courses :-).

[1] https://www.youtube.com/watch?v=UEAMfLPZZhE&list=PLeKd45zvjc...