U.S. Mission to the Organization for Security and Cooperation in Europe

Kate Rebholz joined the U.S. Mission to the OSCE as the Deputy Chief of Mission (DCM) in August of 2025 and has been serving as Chargé d’Affaires a.i. since January 2026.  A career member of the Senior Foreign Service, Ms. Rebholz has served in a combination of State Department domestic and overseas assignments.

Dave Haugen joined the U.S. Mission to the Organization for Security and Cooperation in Europe (OSCE) as Chief Arms Control Delegate in August 2025 and has been serving as Acting Deputy Chief of Mission since January 2025.