From 1996–2005 he was the dean of the school, and from 2005 to 2015 he was the Juan Trippe Professor in international trade, finance, and business. Before that, he was Undersecretary of Commerce for International Trade in the Clinton administration from 1993 to 1995. Previously he worked on Wall Street as managing director at the Blackstone Group and Lehman Brothers. He is the author of five books on the global political economy and numerous articles in "The New York Times", "The Wall Street Journal", "Financial Times", "Newsweek", "Foreign Affairs", and "Harvard Business Review". From 1997–2005 he wrote a monthly column in "Business Week".