- 2025/04 - 現在 Keio University Faculty of Environment and Information Studies Professor
- 2022/11 - 2025/03 内閣官房 内閣参事官
- 2021/04 - 2023/03 Chuo University Faculty of Policy Studies Lecturer
- 2022/04 - 2022/11 総務省 国際戦略局 国際展開課長
- 2022/06 - 2022/06 総務省 国際戦略局 国際協力課長
- 2020/07 - 2022/03 Ministry of Internal Affairs and Communications Office of the Director-General for Cybersecurity Director
- 2018/07 - 2020/07 Ministry of Internal Affairs and Communications (MIC) Administrative Evaluation Bureau Director for Evaluation and Inspection
- 2016/07 - 2018/07 Ministry of Land, Infrastructure, Transport and Tourism (MLIT) Road Administration Division, Road Bureau Director of Road Use Coordination Office
- 2013/07 - 2016/06 Foundation for MultiMedia Communications (FMMC) Research Institute of Telecommunications and Economics (RITE) Chief Representative
- 2012/08 - 2013/06 Ministry of Internal Affairs and Communications (MIC) Tariff and Telecommunications Access Policy Division, Telecommunications Business Department, Telecommunications Bureau Director for Policy Planning
- 2010/04 - 2013/03 Waseda University Faculty of Political Science and Economics Lecturer
- 2011/09 - 2012/08 Ministry of Internal Affairs and Communications (MIC) Global ICT Strategy Bureau Director for Policy Coordination (Negotiator)
- 2011/08 - 2011/09 Ministry of Internal Affairs and Communications (MIC) General Affairs Division, Information and Communications Bureau Director for Policy Coordination
- 2009/07 - 2011/07 Nagasaki University Faculty of Economics & Graduate School of Economics Associate Professor
- 2008/07 - 2009/07 Ministry of Internal Affairs and Communications (MIC) Policy Research Department, Institute for Information and Communications Policy (IICP) Principal Researcher
- 2007/07 - 2008/07 Ministry of Internal Affairs and Communications (MIC) International Economic Affairs Division, Telecommunications Bureau Senior Deputy Director
- 2006/08 - 2007/07 Ministry of Internal Affairs and Communications (MIC) Postal Policy Division, Postal Services Policy Planning Bureau Senior Deputy Director
- 2004/07 - 2006/07 Ministry of Internal Affairs and Communications (MIC) Financial Management Division, Local Public Finance Bureau Deputy Director
- 2001/08 - 2004/07 OECD Directorate for Science, Technology and Industry (STI) Administrator (Policy Analyst)
- 2000/09 - 2001/07 Ministry of Posts and Telecommunications (MPT) (from 01-2001 integrated into MIC) Fund Management Division, Postal Life Insurance Bureau Deputy Director
- 1998/07 - 1999/06 Ministry of Posts and Telecommunications (MPT) Planning and Policy Division, Postal Life Insurance Bureau Section Chief
- 1996/07 - 1998/06 Science and Technology Agency (STA) Space Policy Division, Research and Development Bureau Section Chief
- 1994/04 - 1996/07 Ministry of Posts and Telecommunications (MPT) Planning and Policy Division, Postal Life Insurance Bureau Official
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The Law and Computers Association of Japan
, The Japan Society of Public Utility Economics (JSPU)
, The Japan Society of Information and Communication Research (JSICR)
, The Society of Socio-Informatics (SSI)