Prior to joining CSIS he was a senior fellow at the Center for American Progress, where he focused on Europe, Russia, and U.S. security cooperation. From 2011 to 2017, he served in the U.S. Department of State in a number of different positions, including as a member of the secretary of state’s policy planning staff, where he focused on political-military affairs and nonproliferation; special assistant to the undersecretary for arms control and international security; speechwriter to then secretary of state John Kerry; and senior adviser to the assistant secretary of state for political-military affairs. Before serving in the State Department, Bergmann worked at the Center for American Progress as a military and nonproliferation policy analyst and at the National Security Network as the deputy policy director. Bergmann holds a master’s degree in comparative politics from the London School of Economics and Political Science and a bachelor’s degree in political science from Bates College. His recent commentary has been published in outlets such as Politico (March 2022, August 2022), the Washington Post, Foreign Affairs, and Sasakawa USA.