Richard Dawkins is the former Charles Simonyi Professor of the Public Understanding of Science at Oxford University (1995-2008).

His many bestsellers include The Selfish Gene and The God Delusion.

Sam Harris is the author of the bestselling books The End of Faith, Letter to a Christian Nation, The Moral Landscape, Free Will, and Lying. The End of Faith won the 2005 PEN Award for Nonfiction.

His writing has been published in over fifteen languages. Dr. Harris is cofounder and CEO of Project Reason, a nonprofit foundation devoted to spreading scientific knowledge and secular values in society.

He received a degree in philosophy from Stanford University and a PhD in neuroscience from UCLA.

Daniel C. Dennett is the University Professor and Austin B. Fletcher Professor of Philosophy at Tufts University.

He is the author of numerous books including Intuition Pumps and Other Tools for Thinking, Breaking the Spell, Darwin's Dangerous Idea, and Consciousness Explained.

Christopher Hitchens (1949-2011) was a contributing editor Vanity Fair and a colummnist for Slate. He was the author of numerous books, including works on Thomas Jefferson, George Orwell, Mother Teresa, Henry Kissinger and Bill and Hillary Clinton, as well as his international bestseller and National Book Award nominee, God Is Not Great.

His memoir, Hitch-22, was nominated for the Orwell Prize and was a finalist for the National Book Critics Circle Award.

The most recent of his numerous books are the international bestsellers God is Not Great, Hitch-22, Arguably and Mortality.