David A. Haig is George Putnam Professor of Organismic and Evolutionary Biology at Harvard University.
Daniel C. Dennett is University Professor Codirector of the Center for Cognitive Studies at Tufts University. He is the author of Brainchildren: Essays on Designing Minds; Sweet Dreams: Philosophical Obstacles to a Science of Consciousness; Elbow Room The Varieties of Free Will Worth Wanting; Sweet Dreams: Philosophical Obstacles to a Science of Consciousness (all published by the MIT Press), From Bacteria to Bach and Back: The Evolution of Mind, and other books.