- 2018/04/01 - Hiroshima University School of Informatics and Data Science Professor
- 2006/04/01 - 2018/03/31 Tokyo Metropolitan University Graduate School of Social Sciences Professor
- 2006/04/01 - 2018/03/31 Tokyo Metropolitan University Graduate School of Social Sciences Professor
- 2001/04/01 - 2006/03/31 Kyoto University Graduate School of Economics Professor
- 1997/04/01 - 2001/03/31 Tokyo Metropolitan University Faculty of Economics Professor
- 1997/04/01 - 2001/03/31 Tokyo Metropolitan University Faculty of Economics Professor
- 1989/04/01 - 1997/03/31 University of Tsukuba Graduate School of Systems Management Associate Professor
- 1986/04/01 - 1989/03/31 Tokyo Institute of Technology Department of Information Sciences Assistant Professor
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