Bryan Callen is an actor and stand-up comedian, and together with Brendan Schaub he also hosts "The Fighter & The Kid" podcast.

Sturgill Simpson is an American country music singer-songwriter. He has released two albums independently, "High Top Mountain" & "Metamodern Sounds in Country Music" - https://itunes.apple.com/us/album/metamodern-sounds-in-country/id8657951...

Katy Bowman is a biomechanist, heavy on the bio, and author of books on natural movement & human development, solving diseases of captivity. http://www.katysays.com/

Ms. Pat is a stand-up comedienne, and will have a story featured on an upcoming episode of "This Is Not Happening" on Comedy Central airing Thursday night at 12:30am.

Ali Rizvi is a writer, musician, physician, currently working on his first book, The Atheist Muslim. http://www.huffingtonpost.com/ali-a-rizvi/ http://podcasts.joerogan.net

Josh McDermitt is an actor and comedian. He is best known for playing Eugene Porter on AMC's The Walking Dead.

Joe Schilling is an American Muay Thai kickboxer who competes in the super middleweight and light heavyweight divisions. Joe's upcoming fight is February 6th at Glory 19 on Spike TV.

Ari Shaffir is a stand-up comedian and hosts his own podcasts “Ari Shaffir’s Skeptic Tank.” He also has a new special premiering on Comedy Central, January 16th, 2015 at 11:59pm called "Ari Shaffir: Paid Regular" http://arishaffir.com

Justin Wren is an American MMA fighter, formerly on the Ultimate Fighter. He recently returned from a 1-year mission helping the Pygmy people of the Democratic Republic of the Congo. Learn more about his project here: FightFortheForgotten...

Joe is joined by Eddie Bravo, Brendan Schaub, Tait Fletcher, Ben Saunders, and Justin Milos to watch the fights on Feb. 14, 2015.

Eddie Huang is a restaurateur, food personality, sandwich hack, and former lawyer. His book "Fresh Off The Boat" is the inspiration for a new sitcom of the same name starring Randall Park airing on ABC starting in February.

Randall Carlson is a master builder and architectural designer, teacher, geometrician, geomythologist, geological explorer and renegade scholar.

Bert Kreischer is a stand-up comedian, actor and reality television host. Check out his book "Life of the Party" on Amazon and his podcast "The Bertcast" on Stitcher & iTunes.

Greg Fitzsimmons is a stand-up comedian. He also hosts his own podcast "FitzDog Radio" available on iTunes and every Monday on Sirius Howard 101. http://fitzdogradio.com http://podcasts.joerogan.net

Ari Shaffir is a stand-up comedian and hosts his own podcasts “Ari Shaffir’s Skeptic Tank.” He also has a new season of "This Is Not Happening" premiering on Comedy Central, January 22 at 12:30am. Duncan Trussell is a stand-up comedian, and...