Bryan Cantrill.

http://dtrace.org/blogs/bmc/

Overzealous love of systems, I don't necessarily always agree with him but I always learn something when listening.

Brenden Gregg.

http://www.brendangregg.com/blog/

If I could import someones brain to my own, it would be his.

Kyle Fuller

https://github.com/kylef

Guy is like a UNIX programmer for the modern age.