Elaine Pagels is an American historian of religion. She is the Harrington Spear Paine Professor of Religion at Princeton University. Pagels has conducted extensive research into early Christianity and Gnosticism.

See me speak at Level Up in Atlanta this June: http://levelupconferences.org/

Coleman Hughes is an American writer and podcast host. He is the author of "The End of Race Politics: Arguments for a Colorblind America".

Justin Sledge is currently a part-time professor of philosophy and religion at several institutions in the Metro-Detroit area and a popular local educator. His YouTube channel is "Esoterica".

Rory Stewart is a former UK Government minister, MP, and deputy governor in Iraq following the western invasion. He walked on foot for two years across Afghanistan, Iran, Pakistan, India and Nepal in 2002. He was a private tutor to both Prince William and Prince Harry. He now co-hosts The Rest is Politics with Alastair Campbell, one of the UK's most popular shows.

A.C. Grayling is a British philosopher and author. In 2011 he founded and became the first Master of New College of the Humanities, an independent undergraduate college in London. Buy "Who Owns the Moon?" here.

Thank you all for 750,000 subscribers on YouTube!

Sam Harris is a neuroscientist, philosopher, New York Times best-selling author, host of Making Sense, and creator of Waking Up.

Carlo Rovelli, an Italian theoretical physicist, is known mainly for his contributions to research in the field of quantum gravity. He is the author of Seven Brief Lessons on Physics, The Order of Time, and White Holes, amongst other works.

William Lane Craig is a Christian philosopher and public speaker, who today makes his third appearance on Within Reason. We discuss why Richard Dawkins refuses to debate him, and whether Old Testament slaughter can be justified.

Michael Knowles is an American conservative Catholic political commentator and media host. He has worked for the Daily Wire since 2016.

David Deutsch is a British physicist at the University of Oxford. He is a visiting professor in the Department of Atomic and Laser Physics at the Centre for Quantum Computation in the Clarendon Laboratory of the University of Oxford. (Wikipedia.)

Buy David Deutsch's book, The Beginning of Infinity