A giant in the postwar study of international relations. Helped invent regional integration studies. Introduced systematic social science concepts and methods into the study of international organization, emphasizing how structures, interests, and actor learning interact to produce institutional transformation. Was instrumental in International Organization becoming the leading journal in the field. Author and editor of more than twenty books and monographs, in addition to publishing fifty-six articles and book chapters, including Nationalism, Liberalism, and Progress (Vol. 1): The Rise and Decline of Nationalism (1997); Beware the Slippery Slope: Notes Toward the Definition of Justifiable Intervention (1993); When Knowledge is Power: Three Models of Change in International Organizations (1990); Why We Still Need the United Nations: The Collective Management of International Conflict, 1945–1984 (1986); Global Evangelism Rides Again: How to Protect Human Rights without Really Trying (1978); Scientists and World Order: The Uses of Technical Knowledge in International Organizations (with Mary Pat Williams and Don Babai, 1977); Obsolescence of Regional Integration Theory (1975); International Responses to Technology (with John Gerard Ruggie, 1975); Conflict Management by International Organizations (with Robert L. Butterworth and Joseph S. Nye, 1972); Web of Interdependence: The United States and International Organizations (1970); Human Rights and International Action: The Case of Freedom of Association (1970); Collective Security and the Future International System (1968); Tangle of Hopes: American Commitments and World Order (1967); Politics of Economics in Latin American Regionalism: The Latin American Free Trade Association after Four Years of Operation (with Philippe C. Schmitter, 1965); Beyond the Nation-State: Functionalism and International Organization (1964); Mexico and Latin American Economic Integration (with Philippe C. Schmitter, 1964); Consensus Formation in the Council of Europe (1960); Future of West European Political and Economic Unity (1959); Uniting of Europe: Political, Social, and Economic Forces, 1950–1957 (1958) (Named by the Journal of Foreign Affairs as one of the fifty most significant books in international relations in the past century); Dynamics of International Relations (with Allen S. Whiting, 1956).

The European Union Studies Association has created a fund to honor the memory of Ernst B. Haas, who received its first Lifetime Contribution to EU Studies award in 1999. For more information, please visit http://www.eustudies.org/haasfund.html.

Chair, Board of Editors,

International Organization,

1977–78

Member, Board of Editors,

1976–78, 1980–85, 1987–92