John J. Sullivan

About the Author

John J. Sullivan is an American attorney and government official whose career spans four decades in the public and private sectors. He has served five presidents in prominent diplomatic and legal positions, including as U.S. ambassador to the Russian Federation under Presidents Joe Biden (January 2021 to October 2022) and Donald Trump (December 2019 to January 2021). Before his post in Moscow, he served for almost three years as the U.S. deputy secretary of state. He is currently a distinguished fellow at Georgetown and Columbia Universities, a partner in Mayer Brown LLP, and a member of the congressionally-chartered, bipartisan Commission on Reform and Modernization of the Department of State. He splits his time between the Washington, DC area and Connecticut.