Phil Plait started out as a professional astronomer, but has switched careers a half dozen times, from astronomer to public outreach guy for several NASA satellites to author of two books (Bad Astronomy and Death from the Skies!) to professional blogger - his Bad Astronomy blog is one of the most popular science blogs in the world - to professional skeptic as President of the James Randi Educational Foundation to public speaker and TV science documentary guy.

"Blogger" is the one that's stuck, mostly because of the lack of a pants wearing requirement.

He's a huge and unabashed fanboy and geek, loving Doctor Who, Stargate, Star Trek, MST3K, and pretty much anything with spaceships and aliens, written or televised.