- 1991 - 2004 University of Tsukuba Institute of Education
- 1991 - 2004 Associate Professor,
- 2004 - - 筑波大学大学院人間総合科学研究科助教授
- 2004 - - Associate Professor,
- 1984 - 1991 文部省初等中等教育局小学校課教科調査官(併)幼稚園課教科調査官(機構改革)
- 1984 - 1991 Curriculum Specialist,
- 1981 - 1984 Aichi University of Education
- 1981 - 1984 Associate Professor,
- 1984 - 文部省初等中等教育局小学校教育課教科調査官(併)幼稚園教育課教科調査官
- 1984 - Curriculum Specialist,
- 1978 - 1980 Aichi University of Education
- 1978 - 1980 Assistant Professor,
- Aichi University of Education
- Ministry of Education, Sports and Culture
- University of Tsukuba, Institute of Education
- University of Tsukuba, Graduate School of Comprehensive Human Sciences, School Education
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Mathematical Association
, National Council of Teachers of Mathematics
, 日本数学史学会
, 日本科学教育学会
, 日本数学教育学会
, Japan Socitey of Mathematics Education