David Edmonds is a documentary maker for the BBC World Service, and the author or co-author of several books, including Wittgenstein's Poker, written with John Eidinow (short-listed for the Guardian First Book Award, translated into twenty five languages, and an international best seller) Bobby Fischer Goes To War, (translated into a dozen languages and was long-listed for the Samuel Johnson prize) and Rousseau's Dog about the relationship between Jean-Jacques Rousseau and David Hume. David received a First Class degree in Politics, Philosophy and Economics from Oxford University and then took the B.Phil. in philosophy. He has a PhD in philosophy from the Open University. He has held fellowships from the University of Chicago and the University of Michigan. He is currently a Research Associate at the Uehiro Centre for Practical Ethics at Oxford University and a Contributing Editor for Prospect Magazine. Nigel Warburton is a freelance philosopher, podcaster, and writer. His books include A Little History of Philosophy, Philosophy: the Basics, Thinking from A to Z, Philosophy: the Classics, The Art Question, and Free Speech: A Very Short Introduction. He runs several weblogs including virtualphilosopher.com and artandallusion.com.