Kingman Brewster's exceptionally influential Antitrust and American Business Abroad (1958) came to symbolize an era in antitrust law and in the relationship of U.S. business to international economic activity. It gave conceptual contours to a fundamental problem that had been only dimly perceived before -- namely, the need to define the reach of U.S. antitrust law. In a masterful and much expanded third edition of the book, Professor Spencer Waller marks the transition to a new, very different, and far more complex era in antitrust law and in its significance for international business. We have only begun to recognize and grapple with the extent and implications of these changes, and I here use these two books to underscore some of their key features and implications.