- 2019/04 - 現在 内閣府宇宙政策委員会宇宙安全保障部会 委員
- 2019/04 - 現在 日本経済新聞社 客員論説委員
- 2018/10 - 現在 Pacific Forum Senior Advisor
- 2018/01 - 現在 Global Commission on the Stability of Cyberspace (GCSC) Commissioner
- 2016/04 - 現在 Institute for International Socio-Economic Studies Visiting Scholar
- 2015/04 - 現在 Center for Global Communications, International University of Japan Senior Visiting Research Fellows
- 2018/08 - 2018/12 安全保障と防衛力に関する懇談会 構成員
- 2013/10 - 2016/09 Global Security Institute (G-SEC), Keio University Senior Research Fellow
- 2010/07 - 2016/03 総務省情報通信政策研究所(IICP) 特別上級研究員
- 2009/04 - 2015/03 Center for Global Communications, International University of Japan Visiting Researcher
- 2014/02 - 2015/02 East-West Center Visiting Scholar
- 2009/08 - 2013/10 Information Security Policy Council Expert Member
- 2009/09 - 2013/09 Global Security Institute (G-SEC), Keio University Deputy Director
- 2008/03 - 2009/03 Center for International Studies, Massachusetts Institute of Technology Visiting Scholar
- 2004/01 - 2006/12 Fujitsu Research Institute Visiting Researcher
- 2002/07 - 2004/03 Center for Global Communications, International University of Japan Associate Professor
- 1999/04 - 2004/03 Center for Global Communications, International University of Japan Senior Researcher
- 2001/12 - 2002/06 Cyberspace Policy Institute, George Washington University Visiting Scholar
- 1999/07 - 2002/06 Center for Global Communications, International University of Japan Assistant Professor
- 2001/07 - 2001/12 Center for International Development and Conflict Management, University of Maryland Visiting Scholar
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