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.