Amb. Thomas A. Shannon Jr. is a retired American diplomat who draws on his three decades of government service and diplomatic experience to provide strategic counsel to clients across a range of legislative, foreign policy, and national security issues.
From 2016 to 2018 Amb. Shannon served as Under Secretary of State for Political Affairs, the third highest ranking position at the State Department. Holding the personal rank of Career Ambassador, he was the highest ranking member of the United States Foreign Service, the country's professional diplomatic corps.
During his tenure as Under Secretary, Amb. Shannon was in charge of bilateral and multilateral foreign policymaking and implementation, and oversaw diplomatic activity globally and in U.S. missions to international organizations. He managed the State Department during the presidential transition, led bilateral and strategic stability talks with the Russian Federation, worked with U.S. allies to oversee Iranian compliance with the Joint Comprehensive Plan of Action, and expanded U.S. engagement in Central Asia.