- 2010/04 - 現在 Keio University Institute of Cultural & Linguistic Studies Full Professor
- 2010/10 - 2012/09 Keio University Institute of Cultural & Linguistic Studies Assistant Director
- 2007/08 - 2009/08 The University of Michigan Department of Linguistics Visiting Scholar
- 1999/04 - 2009/03 Keio University Institute of Cultural & Linguistic Studies Associate Professor
- 2006/04 - 2007/07 Keio University Institute of Cultural & Linguistic Studies Assistant Director
- 2000/09 - 2002/08 Massachusetts Institute of Technology Department of Linguistics and Philosophy Fulbright Scholar
- 1997/10 - 1999/03 Keio University Institute of Cultural & Linguistic Studies Assistant Professor
- 1995/07 - 1997/09 The University of British Columbia Department of Linguistics Killam Research Fellow
- 1995/01 - 1995/06 Princeton University Linguistics Program Lecturer
- 1994/07 - 1994/12 Massachusetts Institute of Technology Department of Linguistics and Philosophy Visiting Postdoctoral Fellow
- 1993/07 - 1994/06 Harvard University Department of Linguistics Whiting Research Fellow
- 1991/07 - 1992/06 Harvard University Department of Linguistics Teaching Fellow
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