- 2022/04 - 現在 Rissho University Graduate School of Literary Research Department History major (Doctor's and Master's Degree Programs) Accosiate Professor
- 2022/04 - 現在 Rissho University Faculty of Letters Department of History Associate Professor
- 2015/04 - 現在 Hosei University
- 2020/04 - 2022/03 Atomi University Graduate School of Humanities Department of Japanese Culture (Master's Program) Associate Professor
- 2019/04 - 2022/03 Atomi University Faculty of Letters, Department of Humanities
- 2021/04 - 2021/09 Waseda University School of Humanities and Social Sciences
- 2019/04 - 2019/09 Waseda University Graduate School of Letters, Arts and Sciences
- 2011/07 - 2019/03 宮内庁 書陵部 主任研究官
- 2016/09 - 2018/03 Waseda University Graduate School of Social Sciences
- 2005/04 - 2011/06 宮内庁 書陵部編修課 研究員
- 2007/10 - 2008/09 Ochanomizu University
- 2004/01 - 2005/03 Archives and Mausolea Department, Imperial Household Agency
- 2003/04 - 2003/12 Waseda University Archives
- 1998/05 - 2003/03 国立国会図書館 政治資料課憲政資料室 非常勤調査員
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