Shannon, Thomas Alfred, 1958-

Thomas Alfred Shannon Jr. (born 1958) is an American diplomat.

From 2016 to 2018, Ambassador 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, Ambassador Shannon was in charge of bilateral and multilateral foreign policymaking and implementation, and oversaw diplomatic activity globally and in our 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 our allies to oversee Iranian compliance with the Joint Comprehensive Plan of Action, and expanded US engagement in Central Asia, among other things.

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