- 2014/04 - 現在 Rikkyo University College of Arts Part-Time Lecturer
- 2010/04 - 現在 JSPS: Japanese Society for the Promotion of Science/ Faculty of Letters, Arts and Sciences, Waseda Univ. Research Fellow (Postdoc)
- 2013/11 - 2018/03 Waseda University Institute for European Medieval and Renaissance Studies Guest Researcher
- 2013/05 - 2018/03 Rikkyo University College of Arts Research Assistant
- 2010/04 - 2015/09 Saitama University part-time lecturer
- 2010/04 - 2013/03 JSPS Postdoctoral Research Fellow
- 2011/08 - 2011/08 Árni Magnússson Institute for Icelandic Studies 8th International Summer School in Manuscript Studies
- 2011/06 - 2011/07 School of Liberal Arts (Philosophy and History Course), Saitama University Teaching Assistant
- 2010/08 - 2010/08 The Arnamagnæan Institute, Copenhagen 7th International Summer School in Manuscript Studies
- 2010/08 - 2010/08 アルニ=マグヌッソン研究所(コペンハーゲン) 7th International Summer School in Manuscript Studies
- 2004/04 - 2010/03 European and American Studies (Occidental History), Graduate School of Humanities and Sociology, The University of Tokyo Graduate Student (Doctor)
- 2004/04 - 2010/03 The University of Tokyo Graduate School of Humanities and Sociology
- 2009/07 - 2009/12 Dep. of Occidental History, Faculty of Letters, the University of Tokyo Research Assistant (RA)
- 2009/07 - 2009/12 The University of Tokyo Faculty of Letters
- 2006/08 - 2008/06 Master in Nordic and Medieval Culture, ILN, University of Oslo, Norway Graduate Student (M. Phil.)
- 2006/08 - 2008/06 オスロ大学大学院人文学部 Master in Nordic Viking and Medieval Culture (M. Phil. 2 year's programme)
- 2007/08 - 2007/08 Stofnun Árna Magnússonar í islenskum fræðum, Reykjavík 4th International Summer School in Manuscript Studies
- 2007/08 - 2007/08 アルニ=マグヌッソン研究所(レイキャヴィーク) 4th International Summer School in Manuscript Studies
- 2005/04 - 2006/07 JSPS: Japanese Society for the Promotion of Science Research Fellow (DC2: 2 years)
- 2005/04 - 2006/07 日本学術振興会 特別研究員(DC2)
- 2005/04 - 2006/03 Dep. of Occidental History, Faculty of Letters, the University of Tokyo Teaching Assistant (TA)
- 2005/04 - 2006/03 The University of Tokyo Faculty of Letters
- 2002/04 - 2004/03 European and American Studies (Occidental History), Graduate School of Humanities and Sociology, the University of Tokyo Graduate Student (Master)
- 2002/04 - 2004/03 The University of Tokyo Graduate School of Humanities and Sociology
- 2000/04 - 2002/03 The University of Tokyo History, Faculty of Letters
- 1998/04 - 2002/03 Faculty of Letters (Dep. of Occidental History), the University of Tokyo undergraduate
- 1998/04 - 2000/03 The University of Tokyo College of Arts and Sciences