- 1980 - 1996 The Nippon Dental University
- 1980 - 1996 Nippon Dental University, Assistant Professor
- 1996 - - 日本歯科大学 教授
- 1996 - - Nippon Dental University, Professor
- 1974 - 1980 The Nippon Dental University
- 1974 - 1980 Nippon Dental University, Lecturer
- 1966 - 1974 国立植物ウイルス研究所
- 1966 - 1974 Institute of Plant Virus Research,
- 1966 - The University of Tokyo
- 1966 - University of Tokyo, Research Assistant
- Research Officer
- The Nippon Dental University School of Life Dentistry at Niigata
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