On September 17, Secretary of State John Kerry announced the appointment of Ambassador Stephen D. Mull as Lead Coordinator for Iran Nuclear Implementation. The following is Kerry's statement in full.
I have always said that, as important as it was to negotiate the nuclear deal with Iran, implementing it was going to be even more crucial in meeting our national security objectives. That’s why today I am so pleased to announce the appointment of Ambassador Stephen D. Mull as Lead Coordinator for Iran Nuclear Implementation. As we move past the 60-day Congressional review period, it is vitally important that we now have the right team with the right leader in place to ensure the successful implementation of the Joint Comprehensive Plan of Action (JCPOA), which will make the United States, our friends and allies in the Middle East, and the entire world safer.

Steve will draw on the entire range of his 33 years of government service for this critical task. Prior to his most recent position as our Ambassador to Poland, Steve served from 2010 to 2012 as Executive Secretary of the State Department, coordinating responses to a wide range of crises and managing the Department’s support for the Secretary of State. From 2008 to 2010, Steve served as Senior Advisor to then-Under Secretary of State for Political Affairs William Burns, working on the range of issues related to Iran’s nuclear program and supporting Under Secretary Burns in his capacity as U.S. Political Director in the P5+1 negotiating process. In particular, Steve played a key role in designing United Nations Security Council Resolution 1929, which imposed additional nuclear-related sanctions on Iran, and marshalling support for its adoption by the Council. He also worked closely with the U.S. Mission to the IAEA in pressing for full accountability in Iran’s nuclear program. Steve traveled frequently to engage with foreign partners and worked across the U.S. government in support of our Iran-related efforts, an effort he takes up once again in his new role.
As we move forward with JCPOA implementation, the Department and the entire Administration will continue to work closely with our partners and allies in the region to deepen our security cooperation and to counter Iran’s destabilizing behavior, including its support for terrorism. These concerns and others related to Iran will continue to have the attention of the highest levels of the Department and the U.S. government.
Finally, I again want to thank the countless number of dedicated employees from across the U.S. government who worked tirelessly for many months on the negotiation of this agreement. This impressive interagency effort to get the right outcome that prevents Iran from obtaining a nuclear weapon demands an equally rigorous implementation effort. That’s why Steve Mull is absolutely the right person to lead this effort.
Mull’s Twitter handle is @SteveMullUSA.
Honored and excited to take on US implementation of JCPOA on Iranian nuclear program and work with allies and partners to improve security.
— Stephen D. Mull (@SteveMullUSA) September 17, 2015