Associate Professor, Faculty of Policy Management, Keio University. Concurrently, Senior Research Fellow, Canon Institute for Global Studies (CIGS) and Tokyo Foundation (TKFD). Director, Board of Directors, Civic Force. Visiting Fellow, Genron NPO. Member, International Institute for Strategic Studies (IISS). Main research fields are in international security, Japan-US security relations, Japanese foreign and defence policy, multilateral security in Asia-Pacific and regionalism in East Asia. Policy adviser at various Japanese governmental commissions and research groups. Recent books and articles include: Japan-US-Australia Cooperation on Capacity Building in Southeast Asia; US-Japan-Australia Security Relations: Prospects and Challenges (2015); US Rebalancing to the Asia-Pacific: A Japanese Perspective; The New US Strategy towards Asia: Adapting to the American Pivot (2015); Regional Security Architecture in the Asia-Pacific, Tokyo Foundation (2010) (in Japanese: Ajia Taiheiyo no Chiiki Anzen Hosho Ahkitekucha).