- 2022/04 - 現在 Nihon University, Professor
- 2002/04 - 2022/03 Nihon University, Professor
- 2018/06 - 2018/09 CIRM Scientific Committee CIRM, France Scientific committee member
- 2016/07 - 2016/07 Lecturer of one course, Graduate School of Math., Kyoto University
- 2013/02 - 2013/03 Invited Professor, University of Caen
- 2012/10 - 2012/10 Lecturer of one course, Graduate School of Math., Tohoku University
- 2012/05 - 2012/05 Lecturer of one course, Graduate School of Math., Osaka University
- 2008/10 - 2008/10 Fields Institute, Invited reseacher
- 2006/03 - 2006/03 ESI, Wien, invited researcher
- 2005/12 - 2005/12 Tata Institute of Fundamental Research, Invited researcher
- 2005/01 - 2005/01 University of Lille 1, Invited professor
- 2003/05 - 2003/05 University of Paris 6, Invited Professor
- 2002/11 - 2002/11 Lecturer of one course, Graduate School of Math., Nagoya University
- 1998/04 - 2002/03 Nihon University, Associate Professor
- 2001/09 - 2001/09 Lecturer of one course, Graduate School of Math., Kyushu University
- 2001/05 - 2001/05 University of Colorado, Invited professor
- 1999/05 - 2000/03 Institut des Hautes Etudes Scientifiques, Researcher
- 1999/02 - 1999/02 CEB, Paris, Invited researcher
- 1998/11 - 1998/11 Lecturer of one course, Graduate School of Math., Chuo University
- 1998/10 - 1998/10 Lecturer of one course, Graduate School of Math., Chiba University
- 1993/04 - 1998/03 Nihon University, Lecturer
- 1995/10 - 1995/10 Lecturer of one course, Dept. of Math., Chiba University
- 1995/09 - 1995/09 Lecturer of one course, Dept. of Math., University of Tokyo
- 1995/09 - 1995/09 University of Basel, Invited professor
- 1995/05 - 1995/05 Lecturer of one course, Dept. of Math., Tokyo Institute of Technology
- 1993/06 - 1993/06 ETH, Invited researcher
- 1993/03 - 1993/03 MSRI, Berkeley, Invited Researcher
- 1991/04 - 1993/03 Tokyo Institute of Technology, Assistant
- 1989/03 - 1991/03 Nara Women's University, Assistant