American philosopher and cognitive scientist Daniel Dennett (born on 28 March 1928 in Boston, Massachusetts) is one of the most important theoretical thinkers in the field of philosophy of mind and consciousness studies. Dennett’s philosophical contributions are far-reaching, as they include the problem of free will and evolutionary theory. He graduated in philosophy from Harvard, where he was a student of philosopher and logician W. V. Quine, mentor of Donald Davidson (see Chap. 4), and received his PhD from the University of Oxford, where he studied with Gilbert Ryle. Ryle was editor from 1947 to 1971 of the philosophical journal Mind and achieved international fame for his book The Concept of Mind, published in 1949, in which he criticized Descartes’ theory (see Chap. 6) which considered mind and body as two separate entities. Interestingly, Ryle referred to this distinction as a “categorical mistake.” Daniel Dennett is currently Co-director of the Center for Cognitive Studies and Austin B. Fletcher Professor of Philosophy at Tufts University.