- 2004 - 2008 同上 特任教授
- 1994 - 2004 Taisho University Faculty of Literature
- 2004 - 同上 名誉教授
- 2004 - -08 Professor in Special Extension, ditto
- 2004 - - Professor Emeritus, ditto
- 1981 - 1994 同上 教授
- 1994 - 同上 名誉教授
- 1994 - -04 Professor, Faculty of Letters,
- 1994 - - Professor Emeritus, ditto
- 1974 - 1981 The University of Tokyo Faculty of Letters
- 1981 - -94 Professor, ditto
- 1971 - 1974 同上 助教授
- 1974 - -81 Associate Professor, Faculty of Letters,
- 1967 - 1971 東京外国語大学アジアアフリカ言語文化研究所専任講師
- 1971 - -74 Associate Professor, ditto
- 1964 - 1967 The University of Tokyo Faculty of Letters
- 1967 - -71 Lecturer, Institute for the Study of
- 1964 - -67 Research Assistant,
- Taisho University
- Tokyo University of Foreign Studies
- Languages and Cultures of Asia and Africa,
- University of Tokyo
- Faculty of Letters,
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東方学会
, 日本南アジア学会
, 史学会
, International Association of Tamil Research(国際タミル学会)
, Epigraphical Society of India (インド刻文学会)
, Epigraphical Society of India
, Institute of Eastern Culture
, International Association of Tamil Research
, Japanese Association for South Asian Studies
, Historical Society of Japan