Yuki Tatsumi was appointed Senior Associate of the East Asia program at the Stimson Center in September 2008 after serving as a research fellow since 2004.

Before joining Stimson, Tatsumi worked as a research associate at the Center for Strategic and International Studies (CSIS) and as the special assistant for political affairs at the Embassy of Japan in Washington.

Tatsumi is a co-author of Global Security Watch: Japan (Praeger, 2010), an author of Japan's National Security Policy Infrastructure: Can Tokyo Meet Washington's Expectations? (Stimson Center, 2008), and an editor/contributing author of The New Nuclear Agenda: Prospects for US-Japan Cooperation (Stimson Center, 2012), North Korea: Challenge for the US-Japan Alliance (Stimson Center, 2010), Strategic Yet Strained: US force realignment in Japan and its impact of Okinawa (Stimson Center, 2008), and Japan's New Defense Establishment: Institutions, Capabilities and Implications (Stimson Center, 2007). In September 2006 Tatsumi testified before the House Committee on International Relations. She is a recipient of the 2009 Yasuhiro Nakasone Incentive Award. In 2012 she was awarded the Letter of Appreciation from the Ministry of National Policy of Japan for her contribution in advancing mutual understanding between the United States and Japan.

A native of Tokyo, Tatsumi holds a B.A. in liberal arts from the International Christian University in Tokyo, Japan and an M.A. in international economics and Asian studies from the Paul H. Nitze School of Advanced International Studies (SAIS) at Johns Hopkins University in Washington.