- 1998 - 1998 Tokyo Metropolitan University
- 1998 - 1998 Tokyo Metropolitan University, Lecturer
- 1984 - 1990 Toshiba Corporation
- 1984 - 1990 Senior Specialist
- 1990 - - (株)東芝 研究主幹
- 1990 - - Chief Specialist
- 1977 - 1984 Toshiba Corporation
- 1977 - 1984 Specialist
- 1970 - 1977 Toshiba Corporation
- 1970 - 1977 Toshiba Corporation R & D Center, Researcher
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