Jerry Fodor is the most significant philosopher of mind in the last fifty years. A student of Hilary Putnam, he joined him, Noam Chomsky, and others at MIT in the early 1960s and became the philosopher most responsible for the "cognitive revolution" that replaced the behaviorism that had dominated much of philosophy and psychology since the 1920s, replacing it with a computational approach derived from the work of Alan Turing. In this way he hoped to provide a basis for a naturalist and realist account of mental processes that rendered them amenable to scientific study. Indeed, he is one of the few philosophers who has combined philosophical and empirical psychological research, publishing work in both domains, and developing at least two theories that have become highly influential in each: a computational/representational theory of thought processes ("CRTT") and a "modularity" theory of...