In 2006 she was named the George Blumenthal Professor of Political Economics and International and Public Affairs at Columbia University, where she served as the Senior Vice Dean and Chief Academic Officer at the School of Professional Studies.
She then joined the Columbia University faculty in the Department of Political Science and the School of International and Public Affairs.
She recently advised the Turkish government on the impact of democratization and economic development on political stability; O’Halloran has also consulted with the World Bank's International Finance Group and its Regulation and Competition Policy Group on the impact of trade and political institutions on economic growth and performance, as well as a large project analyzing data on trade openness, international organizations, and their impact on democratic transitions.
], including those affecting the rezoning and economic development of Upper Manhattan, and provided a congressional briefing on the potential impact on the renewal of the 2007 Voting Rights Act.
Her work focuses on formal and quantitative methods and their application to politics, economics, and public policy.