- 2011/04 - 現在 Professor, College of Bioresource Sciences, Nihon University
- 2002/04 - 現在 宇都宮大学農学部 非常勤講師
- 2007/04 - 2011/03 Associate Professor, College of Bioresource Sciences, Nihon University
- 2002/04 - 2007/03 Associate Professor, College of Bioresource Sciences, Nihon University
- 1999/04 - 2002/03 Lecturer, College of Bioresource Sciences, Nihon University
- 1996/10 - 1999/03 Senior Researcher, National Institute for Resources and Environment, AIST, MITI
- 1993/04 - 1996/09 Senior Researcher, National Institute for Resources and Environment, AIST, MITI
- 1992/04 - 1993/04 Post doctoral fellow, Japan Sciety for the Promotion of Science
- 1990/11 - 1991/07 Laboratory Aid, Wadsworth Center, New York State Department of Health
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環境情報科学センター
, The Geochemical Society of Japan
, The Japanese Society of Limnology
, American Geophysical Union