From 1993 to 1994, he was senior adviser for economics on the policy planning staff of the Department of State. He returned to Georgetown University after the NAFTA and Uruguay Round negotiations. He is a consultant to the United Nations, governments in Asia and Latin America, and international business and financial communities. In 2000, he was appointed counselor to the Multilateral Investment Guarantee Agency (MIGA) of the World Bank Group. In 2002, he was chairman of the Committee on Monitoring International Labor Standards of the National Academy of Sciences.