- 1996 - 2001 The Open University of Japan
- 1996 - 2001 Univ. of the Air., Professor
- 2001 - - 関東学院大学 教授
- 2001 - - Kanto-gakuin Univ., Professor
- 1972 - 1975 国際連合本部, 社会経済局上級経済 職員
- 1972 - 1975 United Nation(Head quarter office), Senior Economic Officer
- 1969 - 1973 ,1973-1996 横浜国立大学 助教授('69-'73)・教授(73-96)
- 1969 - 1973 ,1973-1996 Yokohama National Univ., Professor
- 1964 - 1969 Gakushuin University
- 1964 - 1969 Gakushuin Univ., Associate Professor
- 1964 - 1966 大学付属経済研究所 助手・研究員
- 1964 - 1966 Harvard Economic Research Project, Assitant, and Research fellow
- 1960 - 1962 ,1962-1964 埼玉大学 常勤講師(1960〜62)・助教授('62-64)
- 1960 - 1962 ,1962-1964 Univ. of Saitama, Lecturer, and Associate Prof.