Ambassador Thomas A. Shannon, Jr.
Senior International Policy Advisor at Arnold & Porter; Former Under Secretary of State for Political Affairs
Ambassador Shannon is a Senior International Policy Advisor with the law firm Arnold & Porter and cochair of its Global Law and Public Policy practice. He is also cochair of the board of the Inter-American Dialogue. He serves concurrently at Princeton University as the Codirector of the Program in the History and Practice of Diplomacy and as a Visiting Professor. An American diplomat for 35 years, he holds the personal rank of Career Ambassador. Most recently, Shannon served as Under Secretary of State for Political Affairs (2016–18), Counselor of the Department (2013–15), and United States Ambassador to Brazil (2010–13).