Professor Avi Loeb is a theoretical physicist whose areas of professional interest include cosmology and astrophysics. His new book, "Extraterrestrial: The First Sign of Intelligent Life Beyond Earth", proposes that 'Oumuamua, the interstel...

World Wrestling Entertainment Hall of Famer Mark "The Undertaker" Calaway is a thirty-year veteran of the sports entertainment industry, and widely considered one of the best professional wrestlers of all time. Now retired from the ring, hi...

Justin Wren is a professional mixed martial artist, humanitarian aid-worker, and founder of Fight for the Forgotten: a non-profit benefiting the Mbuti Pygmy people of the Congo.

Mark Smith is an airline pilot, mixed martial arts referee, judge, and trainer, and corporate health and wellness advocate. Prior to his career in the private sector, Smith served his country as an Air Force F-16 fighter pilot, with tours a...

Jamar Neighbors is an actor and stand-up comedian.

Ira Glasser is a former director of the American Civil Liberties Union and a lifelong defender of every citizen's right to free speech. He is the subject of the 2020 documentary "Mighty Ira", available now on streaming video.

Scientist Lex Fridman researches human-centered artificial intelligence and autonomous vehicles at MIT, and is also the host of the Lex Fridman podcast.

Fahim Anwar is a stand-up comic, actor, and former aerospace engineer. In addition to starring in his own solo comedy special, "There's No Business Like Show Business" on available on YouTube, Anwar is also a founding member of the sketch c...

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Francis Ngannou is a professional mixed martial artist competing in the heavyweight division of the UFC. When he's not busy training for his next fight, he works to empower the youth of his native Cameroon through the Francis Ngannou Founda...

Dr. Mark Gordon is an expert in the field of neuroregenerative medicine and the treatment of Traumatic Brain Injuries. SFC Andrew Marr is a Green Beret, co-founder of the Warrior Angels Foundation, and author of "Tales from the Blast Factor...

Joe is joined by Brendan Schaub to discuss the fights from UFC 236.

Tim Pool is an independent journalist. His work can currently be found at http://timcast.com and on his YouTube channel: https://www.youtube.com/channel/UCG749Dj4V2fKa143f8sE60Q

Rafinha Bastos is a Brazilian comedian, actor, journalist and television personality.