- 1976 - 1994 Chiba University
- 1976 - 1994 College of Arts and Sciences, Chiba
- 1994 - - 千葉大学理学部 教授
- 1994 - - Faculty of Science, Chiba University, Professor
- 1966 - 1976 The University of Tokyo Faculty of Science
- 1966 - 1976 University of Tokyo, Research Assistant
- University, Assistant Professor
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