The Peterson Institute for International Economics (PIIE), known until 2006 as the Institute for International Economics (IIE), is an American think tank based in Washington, D.C. It was founded by C. Fred Bergsten in 1981 and has been led by Adam S. Posen since 2013. The institute conducts research, provides policy recommendations, and publishes books and articles on a wide range of topics related to the US economy and international economics.