Will MacAskill is a philosopher and notable figure within the effective altruism movement. He is a tutorial fellow in philosophy at Lincoln College, Oxford.

Dan Peña is a businessman and high-performance business coach.

TJ Kirk is a professional ranter, author, and the creator of the YouTube channel, The Amazing Atheist. He is also a co-host of The Drunken Peasants Podcast which is available for download via iTunes.

Greg Fitzsimmons is a writer and stand-up comedian. He also hosts his own podcast "FitzDog Radio" available on iTunes.

John Dudley is a pro archer and host of "Nock On TV." Check out his podcast "Nock On" available on iTunes.

Arian Foster is a former NFL running back. He played college football at Tennessee, and was signed by the Houston Texans as an undrafted free agent in 2009.

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” Alberto Gallazzi is a world-renowned strength and conditioning coach.

Neil deGrasse Tyson is an astrophysicist, cosmologist, author, and science communicator.

Whitney Cummings is a stand up comedian and actress. She is best known as the creator and star of the NBC sitcom Whitney, as well as the co-creator of the CBS sitcom 2 Broke Girls.

Tom Segura is a stand-up comedian, and hosts his own podcast with his wife, Christina Pazsitzky called Your Mom's House. His "No Teeth No Entry" tour starts in 2017, tickets are available at http://tomsegura.com now. Powerful Hoodies - htt...

Henry Rollins is a musician, actor, writer, television and radio host. He hosts a weekly radio show on KCRW, and is a regular columnist for LA Weekly and Rolling Stone Australia.

Greg Fitzsimmons is a writer and stand-up comedian. He also hosts his own podcast "FitzDog Radio" available on iTunes.

Joe is joined by Tom Segura & Bert Kreischer for Day 1 weigh-in of their weight loss challenge.

Brian Redban is a comedian and the founder of the Deathsquad podcast network. Check out his newest podcast called "What Brian Redban Do" at http://deathsquad.tv & on iTunes

Tom Papa is a comedian, actor, writer and television/radio host. Check out his new special "Human Mule" debuts on EPIX on December 9 at 8pm.