- 2021/04 - 現在 The Open University of Japan Visiting Professor
- 2020/04 - 現在 Waseda University Graduate School of Letters, Arts and Sciences Lecturer
- 2016/04 - 現在 University of Tokyo Graduate School Professor
- 2023/04 - 2025/03 The University of Tokyo Graduate School of Humanities and Sociology Dean
- 2016/04 - 2018/03 Keio University Faculty of Letters Lecturer
- 2013/09 - 2016/03 Yokohama City University
- 2012/04 - 2016/03 東京大学文学部
- 2008/04 - 2016/03 Keio University Faculty of Letters Professor
- 2015/09/08 - 2015/09/11 新潟大学 人文学部 非常勤講師
- 2011/04 - 2014/09 Rissho University
- 2011/09 - 2011/09 Kyoto University
- 2010/10 - 2011/03 The University of Tokyo, Graduate School of Arts and Sciences
- 2008/10 - 2011/03 聖心女子大学文学部
- 2007/09 - 2010/03 Tamagawa University, Graduate School
- 2009/09 - 2009/09 九州大学文学部(西洋古典学)
- 2002/04 - 2008/03 Keio University Faculty of Letters
- 2008/02 - 2008/02 University of Barcelona
- 2008/01 - 2008/01 Faculty of Letters, Kyushu University
- 2004/04 - 2006/03 Toyo University, Graduate School
- 2003/04 - 2005/03 Faculty of Letters, University of Tokyo
- 1998/04 - 2002/03 九州大学文学部~九州大学大学院 ,助教授
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The Classical Society of Japan
, ギリシャ哲学セミナー
, Philologica
, ANNALS OF THE WEST UNIVERSITY OF TIMISOARA: SERIES PHILOSOPHY AND COMMUNICATION SCIENCES
, 日本哲学会
, The Korean Society of Greco-Roman Studies
, Classical Society of Japan
, Revue de philosophie ancienne
, The Philosophical Association of Japan
, Philosophical Association of Japan
, Japanese Society for Neoplatonic Studies
, The Philosophical Association of Western Japan
, International Plato Society