He graduated from Georgetown University with a Bachelor of Science degree in International Politics in 1980.
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. He previously served as the Deputy Chief of Mission in Jakarta, Indonesia, and has served as a Consular or Political Officer for the United States. 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 United States. 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-United States. President George West. Bush nominated Mull as the United States. 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.
On April 30, 2009, Mull testified before the United States. Senate Foreign Relations Committee on international efforts to combat piracy off the coast of Somalia. Mull is married to Cheri Stephan.
The Mulls have one child, Ryan.
Stephen Mull was appointed the United States on October 24, 2012. He speaks Polish fluently.
Mull is a career member of the Senior Foreign Service in the class of Minister Counselor.
Married Cheryl Stephan. 1 child Ryan.