Brad Fitzpatrick (https://en.wikipedia.org/wiki/Brad_Fitzpatrick). He invented lots of cool stuff before he got heavily involved with Golang. It was inspiring to see him talking at Perl meetups in Portland back when Perl was cool.

Derek Sivers is a great developer because he shared his experiences learning (at the time Ruby on Rails was brand new). He's doing that same sharing now with a higher level of abstraction, sharing about how to think.