- 1993 - 1996 Yokohama College of Commerce
- 1993 - 1996 Yokohama College of Commerce, Assistant
- 1991 - 1996 Tokyo Institute of Technology
- 1991 - 1996 Tokyo Lnstitute of Technology, Visiting
- 1996 - - 横浜商科大学 教授
- 1996 - - Yokohama College of Commerce, Professor
- 1989 - 1993 Yokohama College of Commerce
- 1989 - 1993 Yokohama College of Commerce, Lecturer
- 1984 - 1992 Waseda University
- 1984 - 1992 Waseda University, Visiting Lecturer
- 1984 - 1989 Yokohama College of Commerce
- 1984 - 1989 Yokohama College of Commerce, Visiting
- Professor
- Lecturer
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