- 1990 - 2001 Utsunomiya University
- 1990 - 2001 Utsunomiya University, Associate Professor
- 2001 - - 宇都宮大学 教授
- 2001 - - Utsunomiya University, Professor
- 1987 - 1990 Utsunomiya University
- 1987 - 1990 Utsunomiya University, Assistant Professor
- 1984 - 1987 University of the Ryukyus
- 1984 - 1987 Ryukyu University, Research Assistant
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