- 2003 - - 早稲田大学人間科学部 特任教授
- 2003 - - Fac. Human Sciences, Waseda Univ., Professor
- 2000 - 2002 Shinshu University Faculty of Science
- 2000 - 2002 Dean of Fac. Science, Shinshu Univ.
- 1990 - 2002 Shinshu University Faculty of Science
- 1990 - 2002 Fac. Science, Shinshu Univ., Professor
- 1973 - 1990 Shinshu University Faculty of Science
- 1973 - 1990 Fac. Science, Shinshu Univ., Associate Professor
- 1971 - 1972 野村総合研究所 副主任研究員
- 1971 - 1972 Nomura Research Institute, Project leader.
- 1968 - 1971 資源科学研究所 研究員
- 1968 - 1971 Institute of Natural Resources, Researcher
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環境科学会
, 国際理論・応用陸水学会
, 日本陸水学会
, 日本生態学会
, Japanese Society of Environmental Sciences
, International Society of Theoretical and Applied Limnology
, Japanese Society of Limnology
, Japanese Society of Ecology