- 1990 - 2000 Tohoku University The Faculty of Arts and Letters
- 1990 - 2000 Professor Faculty of Arts and Letters, Tohoku University
- 2000 - - 東北大学大学院文学研究科 教授
- 2000 - - Professor Graduate School of Arts and Letters, Tohoku University
- 1981 - 1990 Tohoku University The Faculty of Arts and Letters
- 1981 - 1990 Associate Professor. Faculty of Arts and Letters, Tohoku University
- 1978 - 1980 Tohoku University The Faculty of Arts and Letters
- 1978 - 1980 Lecturer. Faculty of Arts and Letters, Tohoku University
- 1973 - 1978 The University of Tokyo Faculty of Letters
- 1973 - 1978 Assistant, the Faculty of Letters, Tokyo University
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