- 2024/04 - 現在 Keio University Faculty of Letters (Hiyoshi) Associate Professor
- 2024/10 - 2025/02 Hokkaido University Faculty of Humanities and Human Sciences Part-time Lecturer
- 2019/04 - 2024/03 Hokkaido University Faculty of Humanities and Human Sciences Associate Professor
- 2019/09 - 2020/09 Utrecht Unviersity Faculty of Humanities, Department of Philosophy and Religious Studies Visiting Researcher
- 2011/04 - 2019/03 Hokkaido University Graduate School of Letters, Associate Professor
- 2013/04 - 2013/09 Graduate School of Letters / Faculty of Letters, Kyoto University Part-time Lecturer (visiting lecture)
- 2012/04 - 2012/09 Faculty of Education and Human Studies, Akita University Part-time Lecturer (visiting lecture)
- 2011/04 - 2011/09 Faculty of Education and Human Studies, Akita University Part-time Lecturer (visiting lecture)
- 2007/04 - 2011/03 Faculty of Education and Human Studies, Akita University Lecturer
- 2009/10 - 2010/03 Akita Study Center, The Open University of Japan Part-time Lecturer (schooling)
- 2009/04 - 2009/09 Japan Red Cross Akita College of Nursing Part-time Lecturer
- 2008/10 - 2009/03 The Open University of Japan, Akita Study Center Part-time Lecturer (schooling)
- 2006/04 - 2007/03 Keio Shiki Senior High School Part-time Lecturer
- 2005/04 - 2007/03 The University of Tokyo Center for Philosophy (UTCP) Project Research Fellow
- 2004/04 - 2007/03 Faculty of Foreign Studies, Reitaku University Part-time Lecturer
- 2004/10 - 2005/09 Faculty of Liberal Arts, Saitama University Part-time Lecturer
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- 2024/08 - 現在 The Society of Ancient Philosophy (Japan) Editorial Committee Member
- 2013/04 - 現在 The Classical Society of Japan Committee Member
- 2012/06 - 現在 The Classical Society of Japan Book Review Committee Member
- 2021/09 - 2025/09 Seminar on Greek Philosophy (Japan) Committee Member
- 2023/04 - 2025/03 Philosophical Association of Japan Councilor
- 2021/04 - 2025/03 The Japanese Society for Ethics Councilor
- 2020/09 - 2024/09 Japanese Society for Neoplatonic Studies Board Member
- 2023/07 - 2024/07 The Hokkaido Philosophical Society Committee Member
- 2023/04 - 2024/03 北海道大学大学院保健科学研究院倫理審査委員会 委員
- 2021/04 - 2024/03 Center for Applied Ethics and Philosophy, Faculty of Humanities and Human Sciences, Hokkaido University Deputy Director
- 2020/12 - 2023/10 日本学術振興会 科学研究費委員会専門委員
- 2018/06 - 2023/05 日本哲学会 編集委員(和文誌)
- 2020/07 - 2022/12 Philosophical Society of Hokkaido University Committee Member
- 2020/11 - 2021/03 Center for Applied Ethics and Philosophy, Faculty of Humanities and Human Sciences, Hokkaido University Steering Committee Member
- 2019/04 - 2019/09 Center for Applied Ethics and Philosophy, Faculty of Humanities and Human Sciences, Hokkaido University Steering Committee Member
- 2017/09 - 2019/09 Seminar on Greek Philosophy (Japan) Committee Member
- 2018/04 - 2019/03 Center for Applied Ethics and Philosophy, Graduate School of Letters, Hokkaido University Deputy Director
- 2016/09 - 2018/09 Japanese Society for Neoplatonic Studies Board Member
- 2016/09 - 2018/08 日本倫理学会 年報編集委員・和辻賞選考委員
- 2016/07 - 2018/07 Philosophical Society of Hokkaido University Committee Member
- 2011/04 - 2018/03 Center for Applied Ethics and Philosophy, Graduate School of Letters, Hokkaido University Steering Committee Member
- 2015/07 - 2017/07 The Hokkaido Philosophical Society Committee Member
- 2010/09 - 2014/09 Japanese Society for Neoplatonic Studies Board Member
- 2011/07 - 2013/07 Philosophical Society of Hokkaido University Committee Member
- 2011/09 - 2013/03 新プラトン主義協会 会誌編集責任者
- 2009/04 - 2012/02 独立行政法人大学入試センター 教科科目第一委員会委員
- 2008/10 - 2011/03 秋田大学医学部付属病院医薬品等受託研究審査委員会 委員
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The Japanese Society of Medieval Philosophy
, Tetsugakukai: The Society of Philosophy (The University of Tokyo)
, The Philosophical Society of Tohoku
, The Hokkaido Philosophical Society
, The Society of Ancient Philosophy (Japan)
, Seminar on Greek Philosophy (Japan)
, Societas Philologorum (Philologica) (Japan)
, Japanese Society for Neoplatonic Studies
, The Classical Society of Japan
, The Philosophical Association of Japan
, The Japanese Society for Ethics
, Philosophy of Science Society, Japan