- 2000 - 2001 Yamagata University, Professor
- 1996 - 2000 森林総合研究所育林技術科長
- 1996 - 2000 Forestry and Forest Product Research Institute, Director of Silviculture Section
- 2000 - - 山形大学教授
- 1984 - 1996 森林総合研究所東北支所研究室長
- 1984 - 1996 Forestry and Forest Product Research Institute, Tohoku Branch, Chief of Lavoratory
- 1972 - 1984 Hokkaido University
- 1972 - 1984 Hokkaido University, Research Assistant
- Yamagata University Faculty of Agriculture-Field Science Center Professor
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