- 1990 - 2004 早稲田大学日本語研究教育センター 教授
- 1990 - 2004 Center for Japanese Language, Waseda
- 2001 - - 早稲田大学大学院日本語教育研究科 教授
- 2001 - - Graduate School of Japanese Applied Linguistics,
- 1988 - 1990 早稲田大学語日本語研究教育センター 助教授
- 1988 - 1990 Institute of Language Teaching, Waseda
- 1985 - 1988 Waseda University
- 1985 - 1988 Institute of Language Teaching, Waseda
- 1982 - 1985 Waseda University
- 1982 - 1985 Institute of Language Teaching, Waseda,
- 1978 - 1982 Waseda University
- 1978 - 1982 Institute of Language Teaching, Waseda
- Waseda Univ., Profesor
- Univ., Professor
- Univ., Associate Professor
- Univ., Full-time Lecturer
- Univ., Research Assistant
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