- 1991 - 1998 Utsunomiya University
- 1991 - 1998 Utsunomiya University, Weed Science Research Center, Professor
- 1990 - 1991 Utsunomiya University
- 1990 - 1991 Utsunomiya University, Professor
- 1980 - 1990 Utsunomiya University
- 1980 - 1990 Utsunomiya University, Associate Professor
- 1977 - 1980 Utsunomiya University
- 1977 - 1980 Utsunomiya University, Lecture
- 1975 - 1977 Utsunomiya University
- 1975 - 1977 Utsunomiya University, Research Assistant
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