I am a rare bookseller based in Las Vegas, where I manage a gallery for Bauman Rare Books. I started appearing in Season 4 of Pawn Stars in 2011 to appraise antique books and occasionally documents for the shop.
I keep up a blog and a Facebook page with interesting facts about books and advice on book collecting:
Also visit my company's site to see what I really do outside of Pawn Stars: www.baumanrarebooks.com
Edit: Thanks to everyone for participating! You guys are feisty and funny. By the way, playing around on Reddit while answering questions, I came across this thread: http://www.reddit.com/r/reddit.com/comments/gaagd/this_is_a_true_story_that_happened_to_me_tonight/ The "girl" at the shop was me--and I actually tell that story myself sometimes, about the visitor with the clever Heisenberg joke. You guys rock. -R