Judge Richard Posner is one of the great legal minds of our age, on par with such generation-defining judges as Holmes, Hand, and Friendly. A judge on the U.S. Court of Appeals for the Seventh Circuit and the principal exponent of the enormously influential law and economics movement, he writes provocative books as a public intellectual, receives frequent media attention, and has been at the center of some very high-profile legal spats. He is also...