Simmons is best known for her research on international political economy during the interwar years, policy diffusion globally, and her work demonstrating the influence that international law has on human rights outcomes around the world. Two of her books, Who Adjusts? Domestic Sources of Foreign Economic Policy During the Interwar Years (1994) and Mobilizing for Human Rights: International Law in Domestic Politics (2009) won the American Political Science Association’s Woodrow Wilson Award for the best book published in the United States on government, politics, or international affairs. The latter was also recognized by the American Society for International Law, the International Social Science Council and the International Studies Association as the best book of the year in 2010. She is currently conducting research in three areas: global performance assessments as informal governance mechanisms in international affairs; international border crossings, and especially evidence of their “thickening” in recent decades in many parts of the world; and international and transnational crime. Simmons has spent a year working at the International Monetary Fund, directed the Weatherhead Center for International Affairs at Harvard, is a past president of the International Studies Association, and has been elected to the National Academy of Sciences and the American Academy of Arts and Sciences.