Feynman is definitely one my greats. Big part of it is probably his storytelling skills and his ability to rewrite reality, but all that was only possible thanks to his real contributions to science and his pedagogical skills.

Surely you're joking mister Feynman. Recommend this book to get to know his character.

Terrance Tao is one of greats, still alive. If you consider mathematics to be the purest of sciences.