Rich Hickey. He's brilliant and is arguably the best deeply technical speaker I have ever seen/heard.
Honorable mentions:
- Nathan Stott (worked with me early in my career and taught me to love Javascript)
- Michael Lopp (aka Rands in Repose)
- Gary Bernhardt
- José Valim
- Joe Armstrong
- Yehuda Katz
- My dad (who taught me patience and the value of hard work)
- Harvey Specter
- Thomas Ptacek (whose consulting wisdom I cannot appreciate enough)