rsc is one of the most brilliant minds of 21st century software engineering. A very lucid thinker and speaker, too. While not everyone likes stuff he works on (ex: Golang), his insight and brain power are unmistakable.

One such example to me is his overview of Acme: https://www.youtube.com/watch?v=dP1xVpMPn8M

Russ's demo is one of the clearest technical demos I've seen.