A former supervisor of economics research at Bell Laboratories, he is the coauthor of Welfare Analysis of Policies Affecting Prices and Products, and Contestable Markets and the Theory of Industry Structure, and coeditor of The Handbook of Industrial Organization and Can Privatization Deliver?: Infrastructure for Latin America. A fellow of the Econometric Society, he has served on the editorial boards of the American Economic Review and the Journal of Industrial Economics. He served in the Antitrust Division of the U.S. Department of Justice as deputy assistant attorney general for economics, 1989–1991, and has been a member of policy task forces under the aegis of the Governor of New Jersey, the Defense Science Board, and the National Research Council. He works with the Inter-American Development Bank and the World Bank on issues of infrastructure privatization and competition policy. He has written numerous articles including “Consumer’s Surplus without Apology,” “Free Entry and the Sustainability of Natural Monopoly,” and “Merger Analysis, IO Theory, and Merger Guidelines.” Ph.D. Stanford University.