- 1988 - 1995 Yamagata University Faculty of Science
- 1988 - 1995 Faculty of Science, Yamagata University, Professor
- 1995 - - 北海道大学大学院理学研究科 教授
- 1995 - - Graduate School of Science, Hokkaido University, Professor
- 1991 - 1993 米国ウッヅホール海洋研究所 研究員
- 1991 - 1993 Woods Hole Oceanographic Institution U. S. A. Assistant Scientist
- 1976 - 1988 Yamagata University Faculty of Science
- 1976 - 1988 Yamagata University, Associate Professor
- 米国ラモント・ドハテイ地質学研究所 研究員
- Lamout-Doherty Geological Observatory of Columbia Univ.(U. S. A.) Research Associate
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