Noam Chomsky is one of the most influential thinkers of modern times. The most cited writer in the humanities, his work has revolutionized the field of linguistics, and has dominated many other disciplines including politics and the philosophy of mind and human nature. This Companion brings together a team of leading linguists, philosophers, cognitive scientists and political theorists to consolidate the disparate strands of Chomsky's thought into one accessible volume and an essential guide to one of the leading intellectual figures of our time.