John Lennox is an Emeritus Professor of Mathematics at the University of Oxford and Emeritus Fellow in Mathematics and the Philosophy of Science at Green Templeton College. He is also an Associate Fellow of the Said Business School. He is particularly interested in the interface of science, philosophy and theology. Lennox has been part of numerous public debates defending the Christian faith against well-known atheists including Richard Dawkins, Christopher Hitchens and Peter Singer. He is the author of a number of books, and chatted to Clayton about his book, 'Science and God: Do You Have to Choose?'