- 2015/05 - 現在 Meiji University Researcher/ Visiting Professor
- 2003 - 現在 Tokai University, Professor
- 2014/04 - 2015/03 Tokai University Math Dept Part-time Lecturer
- 2003/04 - 2014/03 Tokai University Math Dept etc. Professor
- 2001/04 - 2003/03 Tokai University Research Institute of Educational Development Associate Professor
- 2001 - 2003 Tokai university, Associate Professor
- 1994/04 - 2001/03 Tennessee Meiji Gakuin High School Math teacher
- 1994 - 2001 Tennessee Meijigakuin High School, Teacher
- 1993 - 1994 ブラントカウンティー補習校高等部 講師
- 1993 - 1994 Blount Country Japanese School, Lecturer
- 1992 - 1994 テネシー大学 Adjunct Assistant Professor
- 1992 - 1994 University of Tennessee, Adjunct Assistant Professor
- 1989 - 1992 Jissen Women's University
- 1989 - 1992 Jisen Women University and Nippon University part-time Lecturer
- 1981 - 1992 武蔵工業大学 助手('81-'85)を経て講師('85-'92)
- 1981 - 1992 Musashi Institute of Technology Assistant('81〜'85), Lecturer('85〜'92)
- 1985 - 1986 ミシガン大学 客員研究員
- 1985 - 1986 University of Michigan Visiting Scholor
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Japan Origami Society
, 日本数学会
, Mathematical Association of America
, Japan Mathematical Society
, American Mathematical Society