Dr. Richard Dawkins Author of The Selfish Gene, The Blind Watchmaker, The God Delusion, The Greatest Show on Earth, and more; Founder of the Richard Dawkins Foundation for Reason and Science.

Dr. PZ Myers Blogger at Pharyngula; Professor of Biology at the University of Minnesota Morris.

Taslima Nasrin Author of more than thirty books, including Lajja (“Shame”); Prolific activist for gender equality, free thought, and human rights.

Paul Provenza Host and producer of The Green Room with Paul Provenza on Showtime and producer of the movie The Aristocrats (with Penn Jillette)

James Randi Founder of the James Randi Educational Foundation; Creator of The One Million Dollar Paranormal Challenge; Magician (known as “The Amazing Randi”).

Bad Religion Legendary rock band fronted by singer/songwriter Greg Graffin.

Jamila Bey Journalist; Former Editor and Producer for National Public Radio.

Greta Christina Greta Christina is one of the most widely-read and well-respected bloggers in the atheist blogosphere. She blogs at the cleverly named Greta Christina’s Blog, and is a regular contributor on atheism to the online political magazine, AlterNet. She was ranked by an independent analyst as one of the Top Ten most popular atheist bloggers, and her writing has appeared in numerous magazines, newspapers, and anthologies. She tweets at @GretaChristina. And she is author of the new book, “Why Are You Atheists So Angry? 99 Things That Piss Off the Godless,” just published on Kindle and Nook.

Dr. R. Elisabeth Cornwell Executive Director of the US branch of the Richard Dawkins Foundation for Reason and Science.

Fred Edwords National Director of the United Coalition of Reason.

Jesse Galef Communications Director, Secular Student Alliance

Dr. Greg Graffin Lead vocalist and songwriter of Bad Religion. He obtained his PhD in zoology at Cornell University, and has served as a lecturer in life sciences and paleontology at UCLA. Currently teaching Evolution at Cornell, he splits his time between Ithaca, New York, and Los Angeles.

Jamie Kilstein Comedian featured on Showtime, The Green Room, Conan, and Keith Olbermann. And Citizen Radio has been praised by such people as Noam Chomsky, Howard Zinn, Peter Singer, Sarah Silverman, Rachel Maddow, etc.

Lawrence Krauss A highly regarded international leader in cosmology and astrophysics and author, most recently of the New York Times bestseller A Universe From Nothing: Why There is Something Rather Than Nothing

Ron Lindsay Bioethicist; Lawyer; President, Chief Executive Officer, and Senior Research Fellow at the Center for Inquiry.

Cristina Rad Popular YouTube activist

Michael Shermer Dr. Michael Shermer is the Founding Publisher of Skeptic magazine, a monthly columnist for Scientific American, and an Adjunct Professor at Claremont Graduate University and Chapman University. Dr. Shermer’s latest book is The Believing Brain: From Ghosts and Gods to Politics and Conspiracies—How We Construct Beliefs and Reinforce Them as Truths.

David Silverman President of American Atheists.

Roy Speckhardt Executive Director of the American Humanist Association.

Rep. Pete Stark First openly atheistic member of Congress. (video)

Sen. Tom Harkin Senator (D-IA) of 27 years (video)

Todd Stiefel Founder of the Stiefel Freethought Foundation.

Rational Warrior a.k.a Tombstone Da Deadman Tombstone’s recent recording “Poison” was highlighted on the ‘The Atheist Experience’ after a fan shared the song with the show’s host, Matt Dillahunty on Facebook. His current album “Rise of the Infidel” highlights his passion for true hip hop and stays true to the basic principles of that art form’s culture. Through his art, Tombstone will continue the quest to promote skeptical thought and critical thinking.

Nate Phelps The (estranged) son of Westboro Baptist Church leader Fred Phelps, Nate severed ties with his notorious family decades ago and now speaks out in favor of LGBT rights and raises awareness of religion-based child abuse.