- 2023/11 - 現在 国立社会保障・人口問題研究所 評議員
- 2023/06 - 現在 The University of Tokyo
- 2023/04 - 現在 Tokyo Gakugei University Professor
- 2014/04 - 2023/04 The University of Tokyo Graduate School of Mathematical Sciences Professor
- 2007/04 - 2014/03 The University of Tokyo Graduate School of Mathematical Sciences Associate Professor
- 1996/04 - 2007/03 The University of Tokyo Graduate School of Mathematical Sciences Associate Professor
- 1993/11 - 1996/03 Institute of Population Problems, Ministry of Health and Welfare
- 1992/04 - 1993/10 Institute of Population Problems, Ministry of Health and Welfare senior research officer
- 1982/04 - 1992/03 Institute of Population Problems, Ministry of Health and Welfare researcher
- 1988/07 - 1990/07 Institute of Theoretical Biology, Leiden University Visiting Researcher
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