He is concurrently a Japan-U.S. Partnership Fellow at the Research Institute for Peace and Security (RIPS), Tokyo, and has completed the Postdoctoral Fellowship in the International Studies Program, the Belfer Center for Science and International Affairs, Harvard Kennedy School. His research interests include international relations theory, international security, international institutions, institutional changes, and East Asian regional security, with current research focus on U.S.-bilateral security networks and ASEAN–led institutions. Previously, he served as a Vasey Fellow at the Pacific Forum CSIS in 2009–2010 and as the RSIS-MacArthur visiting associate fellow at the RSIS, NTU in 2010. He received a Ph.D. in International Relations at the Fletcher School of Law and Diplomacy, Tufts University.