- 2021/07 - 現在 National Institute of Informatics
- 2021/04 - 現在 National Institute of Informatics Information and Society Research Division Director
- 2020/04 - 現在 Japanese representative, IFIP TC11 (Security and Privacy Protection in Information Processing Systems)
- 2019/04 - 現在 Professor, Department of Information and Communication Engineering, Graduate School of Information Science and Technology, The University of Tokyo
- 2017/04 - 現在 Visiting Professor, Joint Support-Center for Data Science Research
- 2017/04 - 現在 Professor, Information and Society Research Division, National Institute of Informatics
- 2014/04 - 現在 Professor, Department of Informatics, School of Multidisciplinary Sciences, The Graduate University for Advanced Studies (SOKENDAI)
- 2020/04 - 2021/03 Advisor to the Director General, National Institute of Informatics
- 2019/04 - 2020/03 Acting Director General / Deputy Director General, National Institute of Informatics
- 2017/04 - 2020/03 Visiting Professor, Tsuda College
- 2016/04 - 2020/03 Scientific Research Senior Specialist, Research Promotion Bureau, Ministry of Education,Culture,Sports,Science and Technology
- 2018/04 - 2019/03 Deputy Director General, National Institute of Informatics
- 2017/04 - 2019/03 Director, Information and Society Research Division, National Institute of Informatics
- 2017/04 - 2018/03 Advisor to the Director General, National Institute of Informatics
- 2014/04 - 2017/03 Professor, Digital Content and Media Sciences Research Division, National Institute of Informatics National Institute of Informatics
- 2007/04 - 2014/03 Associate Professor, Department of Informatics, School of Multidisciplinary Sciences, The Graduate University for Advanced Studies (SOKENDAI)
- 2007/04 - 2014/03 Associate Professor, Digital Content and Media Sciences Research Division, National Institute of Informatics
- 2011/10 - Visiting Professor, University of Halle-Wittenberg
- 2010/04 - Visiting Professor, Institute of Computer Science and Social Studies, University of Freiburg
- 1997/04 - 2007/03 Systems Development Laboratory, Hitachi, Ltd.