Daniel Dennett

Early Life and Education

Daniel Clement Dennett III was born on March 28, 1942, in Boston, Massachusetts. His father was a historian and diplomat who served as a cultural attaché in Beirut. After his father's death in a plane crash when Daniel was five, the family returned to Massachusetts.

Dennett studied philosophy at Harvard, where he was influenced by W.V.O. Quine, and earned his D.Phil. at Oxford under the supervision of Gilbert Ryle. Ryle's behaviorism and his commitment to dissolving philosophical pseudo-problems through careful attention to ordinary language left a lasting mark on Dennett's approach.

Content and Consciousness (1969)

Dennett's first book, Content and Consciousness (1969), already contained the seeds of his mature philosophy: a commitment to explaining mental phenomena in terms compatible with natural science, without either eliminating them (as the eliminative materialists proposed) or leaving them as irreducible mysteries (as dualists claimed).

The Intentional Stance

Dennett's theory of the intentional stance, developed across Brainstorms (1978), The Intentional Stance (1987), and subsequent works, proposes that we explain and predict behavior by adopting one of three interpretive stances: the physical stance (using laws of physics), the design stance (using knowledge of functional design), and the intentional stance (attributing beliefs, desires, and rationality to the system).

The intentional stance is not a claim about the inner workings of a system but a predictive strategy: any system whose behavior is best predicted by attributing beliefs and desires is, for that reason, a believer and desirer. This instrumentalist approach dissolves the question of whether a thermostat or a chess computer "really" has beliefs — the question is whether the intentional stance yields good predictions.

Consciousness Explained (1991)

Dennett's most ambitious and controversial work, Consciousness Explained (1991), attacked what he called the "Cartesian Theater" — the intuitive but, he argued, incoherent picture of consciousness as a central place in the brain where "it all comes together" for a unified observer. In its place, Dennett proposed the "Multiple Drafts Model": consciousness consists of multiple parallel processes of interpretation and elaboration, with no single definitive "stream of consciousness" or privileged observer.

Dennett argued that qualia — the subjective, intrinsic qualities of experience (the redness of red, the painfulness of pain) — do not exist as traditionally conceived. What we call qualia are dispositional properties of brain states that can be fully characterized in functional and behavioral terms. Critics (notably David Chalmers, Thomas Nagel, and John Searle) charged that Dennett had "explained consciousness away" rather than explaining it.

Darwin's Dangerous Idea (1995)

Darwin's Dangerous Idea (1995) defended the view that natural selection is a "universal acid" — an idea so powerful that it transforms every field it touches. Dennett argued that evolution by natural selection is an algorithmic process that explains the emergence of design, meaning, and intelligence without any top-down designer. He defended "adaptationism" against Stephen Jay Gould's critique and argued that Darwinian thinking should be extended to cultural evolution (memes).

Freedom Evolves and Later Work

Freedom Evolves (2003) defended a compatibilist account of free will, arguing that the kinds of freedom worth wanting are compatible with — and indeed require — determinism. Breaking the Spell (2006) applied evolutionary and cognitive science to religion, treating it as a natural phenomenon to be studied scientifically.

Dennett was the Austin B. Fletcher Professor of Philosophy and co-director of the Center for Cognitive Studies at Tufts University for most of his career. He was one of the "Four Horsemen" of New Atheism, alongside Richard Dawkins, Sam Harris, and Christopher Hitchens. He died on April 19, 2024, in Portland, Maine.