Key Officers

Min Chang has served as the Deputy Counselor for International Atomic Energy Agency (IAEA) Affairs at the U.S. Mission Permanent Mission to International Organizations in Vienna, Austria since 2016, and as Acting Counselor since August 2018.  His team is responsible for representing the United States at the IAEA on a range of issue including nuclear safety and security, technical cooperation and nuclear applications, IAEA budget and personnel, and nuclear energy.

Previously, he was the Internal Unit Chief in the Economic Section at the U.S. Embassy in Beijing (2013-2016), charged with managing a team of seven officers and four local staff, analyzing and reporting on China’s political economy.  Mr. Chang’s earlier assignments included service as a Special Assistant to the U.S. Permanent Representative and as a Political Advisor at the U.S. Mission to the United Nations in New York (2009-2011), an Economic Officer at the U.S. Embassy in Seoul, South Korea (2006-2009), and a Consular Officer at the U.S. Embassy in Port of Spain, Trinidad and Tobago (2004-2006).

He holds a B.A. in Economics from Brown University, and a Juris Doctor and LL.M. in International and Comparative Law from Duke University School of Law.  Mr. Chang is married with two children.

Matthew Sharp joined UNVIE as the Deputy IAEA Counselor for Safeguards issues in July 2017.  His team focuses on the IAEA’s Department of Safeguards, including activities relevant to Iran and DPRK, as well as a number of political issues in the IAEA fora, in particular those with a Middle East nexus.  The team also coordinates a large portfolio of U.S. assistance to the Safeguards Department and the IAEA’s LEU Bank.

Matthew joined the State Department’s Bureau of International Security and Nonproliferation (ISN) in 2009 as an American Association for the Advancement of Science (AAAS) Fellow, and subsequently remained in ISN as a Civil Servant working on a variety of IAEA and Nuclear Nonproliferation Treaty-related issues.  In a 2012-2014 sabbatical from ISN, Matthew covered nuclear nonproliferation, security, and nuclear cooperation issues for the State Department’s European Affairs Bureau, where he had a particular focus on Ukraine and Russia issues.

Prior to joining the State Department, Matthew held a postdoctoral fellowship at the Kennedy School’s Project on Managing the Atom after finishing his Ph.D. at the University of Chicago’s Department of Physics.  He is married and has one daughter.

Jennifer Harwood joined the UN Affairs Section in December 2016. Her portfolio includes supervising the section’s staff and covering counternarcotics, budget, and research issues.

Prior to her current assignment, Jennifer served as a Staff Aide and a Consular Officer in Manila. From 2012-2014 she served as an Economic Officer at the U.S. Mission to the OECD in Paris and as a Political Officer on the Mali desk during the 2012 crisis. Jennifer joined the State Department’s Bureau of International Narcotics and Law Enforcement Affairs (INL) in 2005 and remained with INL until 2011.  During that time, she served as the counternarcotics team lead for INL’s Afghanistan and Pakistan Office.

Before joining the State Department, Jennifer worked in federal law enforcement as an analyst supporting criminal investigations. She also taught sociology courses at George Washington University and American University. Jennifer holds a BA in International Relations and a BA in German from the University of North Carolina at Chapel Hill and a MA in Sociology from American University.

Erik Martini arrived in Vienna in August, 2016 as the Mission’s Arms Control Counselor, which has primary responsibility for covering nuclear disarmament, the Comprehensive Nuclear-Test-Ban Treaty, the Nuclear Supplier’s Group, the Wassenaar Arrangement, and the Hague Code of Conduct Against Ballistic Missile Proliferation.  He is the alternate U.S. Representative to the CTBT Preparatory Commission and focuses on matters related to preparations for CTBT entry-into-force.

Prior to his posting in Vienna, he was Political and Economic Section Chief in Lahore, Pakistan, Deputy Chief of the Political and Economic Section in Yaounde, Cameroon and also served as a Watch Officer in the State Department’s Operations Center in Washington DC.  Previous postings include Quito, Ecuador and Chennai, India.

Before joining the State Department, Erik was a commercial litigator for McGuire Woods LLP in its Baltimore office.  He obtained his undergraduate and law degrees from the University of Wisconsin at Madison and, in between, served as a Peace Corps Volunteer in Guatemala and as a staff assistant to a Member of Congress in Washington.

Justen Thomas has served as Advisor for Public Affairs at the U.S. Mission to International Organizations in Vienna since July 2018.  He previously worked as First Secretary and Deputy Public Affairs Officer at the U.S. Embassy in Havana, Cuba from August 2016 until June 2018.

Prior to that, Justen was the Spanish and Portuguese-language Spokesperson for the Department of State, working from the Department’s Media Hub of the Americas in Miami, Florida.  Other assignments include Staff Assistant in the Bureau of Western Hemisphere Affairs in Washington, D.C., Assistant Cultural Affairs Officer at the U.S. Embassy in Brasilia, Brazil, and Vice-Consul at the U.S. Embassy in Paris, France.

Justen holds a Master of Science degree in International Development from the University of Bristol in the UK, and a Bachelor of Arts degree from the University of Wisconsin with majors in Economics, International Relations, and Spanish.