Stephen D. Mull (born April 30, 1958) is a Senior Foreign Service officer who previously served as United States Ambassador to Poland, Acting Assistant Secretary of State for Political-Military Affairs and United States Ambassador to Lithuania.
Ambassador Mull holds the rank of Career Ambassador, the highest diplomatic rank in the United States Foreign Service.
On September 18, 2015, Mull was appointed as the United States Lead Coordinator for Iran Nuclear Implementation, tasked with carrying out the terms of the Joint Comprehensive Plan of Action by United States Secretary of State John Kerry.
Mull is a career member of the Senior Foreign Service in the class of Minister Counselor. He previously served as the Deputy Chief of Mission in Jakarta, Indonesia, and has served as a Consular or Political Officer for the U.S. Missions in Poland, the Bahamas, and South Africa since the beginning of his career in the Foreign Service in 1982.
Prior to his assignment in Jakarta, Mull worked as Deputy Director of the State Department Operations Center, as Political Counselor at the U.S. Embassy in Warsaw, Poland, as Director of the Office of Southern European Affairs in the Bureau of European Affairs, and as Deputy Executive Secretary in the Office of the Secretary of State.
On March 10, 2003, then-U.S. President George W. Bush nominated Mull as the U.S. Ambassador to Lithuania. After being confirmed by the Senate, he assumed his position on August 26, 2003. He completed his tour of duty on July 18, 2006.
Mull is married to Cheri Stephan. The Mulls have one child, Ryan.
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