Thomas J. Biersteker is an American political scientist and a notable constructivism scholar.

He became the first Curt Gasteyger Professor of International Security at the Graduate Institute of International and Development Studies (IHEID) in Geneva, Switzerland in 2007, where he is also a member of the Centre on Conflict, Development and Peacebuilding.

[2] His more recent work included advising the United Nations’ Secretariat and the governments of Switzerland, Sweden and Germany on the design of targeted sanctions.

He was the Olive C. Watson Professor of International Studies at the Watson Institute for International Studies, and earlier the Henry R. Luce Professor of Transnational Organizations in the Department of Political Science at Brown University, from 1992–2006.

He was an associate professor in the Department of Political Science at Yale University, where he taught from 1976–1985.