- 2008/04 - 現在 Professor, Department of Global and Interdisciplinary Studies (GIS)
- 2018/04 - 2019/03 Dean of Department of Global and Interdisciplinary Studies (GIS),Councillor of Hosei University
- 2011/04 - 2016/03 Guest Researcher, New Zealand Institute, Waseda University
- 2008/04 - 2011/03 Dean of Department of Global and Interdisciplinary Studies (GIS) Councillor of Hosei University
- 2006/04 - 2008/03 Director and Adjunct Professor, Institute for Global and Interdisciplinary Studies (IGIS), Hosei University
- 2003/04 - 2008/03 Professor, Faculty of Intercultural Communications, Hosei University
- 2002/04 - 2003/03 Visiting Scholar, Department of Linguistics, University of Canterbury
- 1999/04 - 2003/03 Professor, Faculty of General Arts I, Hosei University
- 1993/04 - 1999/03 Associate Professor, Faculty of General Arts I, Hosei University
- 1996/04 - 1998/03 Visiting Scholar, Department of Linguistics, University of Canterbury
- 1993/04 - 1996/03 Part-time Lecturer, Department of English, Japan Women's University
- 1989/04 - 1996/03 Part-time Lecturer, Faculty of Letters, Meiji-gakuin University
- 1991/04 - 1993/03 Full-time Lecturer, Faculty of General Arts I, Hosei University
- 1991/04/01 - 1993/03/01 Full-time Lecturer, Faculty of General Arts I, Hosei University
- 1984/04 - 1989/03 Part-time Lecturer, Department of English and American Literature, Rissho University
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Linguistic Society of New Zealand
, The Japanese Association for Asian Englishes
, The Japanese Association of Sociolinguistic Sciences
, The Japan Society for New Zealand Studies
, The Japanese Association for English Studies
, International Association for World Englishes
, Linguistic Society of New Zealand