Christopher Ryan, PhD is a psychologist, speaker, and author of New York Times best seller "Sex At Dawn" - http://chrisryanphd.com/ http://podcasts.joerogan.net

Artie Lange is an actor, writer, comedian, radio personality, and author. He recently started his own podcast available at http://ArtieQuitter.com

Keith Weber is the creator of "Extreme Kettlebell Cardio" DVDs, a physiotherapist, triathlete, and "physical culturist."

Professor Brian Cox is an English physicist and Professor of Particle Physics in the School of Physics and Astronomy at the University of Manchester in the UK. His BBC science comedy show/podcast "Infinite Monkey Cage" with comedian Robin I...

Paul Stanley is an American hard rock guitarist, singer, and painter, best known for being the frontman of the rock band Kiss.

W. Kamau Bell is a stand-up comic and former host of the FXX television series "Totally Biased with W. Kamau Bell"

Joey “CoCo” Diaz is a Cuban-American stand up comedian and actor. Joey also hosts his own podcast called “The Church of What’s Happening Now” http://www.joeydiaz.net http://podcasts.joerogan.net

Shane Smith is a Canadian-American journalist. He also is the co-founder and CEO of the international media company VICE.

Rory Albanese is a stand-up comedian and former executive producer/writer for The Daily Show with Jon Stewart. He's currently working on the Sundance Channel's "The Approval Matrix" and next year look for him on "Minority Report" on Comedy...

Cameron Hanes is a bowhunting athlete, "training intensively each and every day to become the Ultimate Predator."

David Choe is an American painter, muralist, graffiti artist and graphic novelist from Los Angeles, CA. Check out his podcast at DVDASA.com

Trevor Valle is paleontologist and the host of 'Mammoth Unearthed' debuting on October 26th on the NatGeo Channel.

Anthony Cumia is an "exiled radio host" formerly of The O&A Show, now hosting The Anthony Cumia Show available at AnthonyCumia.com

Sue Aikens is a woman living in Kavik, 197 miles North of the Arctic Circle in extreme isolation. Her motto is "If it hurts, don't think about it." Check out on the new season of "Life Below Zero" on NatGeo November 4th.