- 2018/04 - 現在 International Christian University Graduate School of Arts and Sciences, Education and Psychology Program Program Director
- 2018/04 - 現在 International Christian University Institute for Educational Research and Service Director
- 2010/04 - 現在 International Christian University, Graduate School Program of Education and Psychology, Professor
- 2008/04 - 現在 International Christian University, Department of Language Education, Professor
- 2010/04 - 2011/03 GS Program Director, Education and Psychology, International Christian University
- 2008/04 - 2010/03 International Christian University Graduate School, Division of Education
- 2001/04 - 2010/03 International Christian University, Graduate School Division of Education, Professor
- 2001/04 - 2008/03 International Christian University, Division of Languages, Professor
- 2005/04 - 2007/03 International Christian University College of Liberal Arts
- 2001/04 - 2004/03 International Christian University
- 1999/04 - 2001/03 International Christian University
- 1998/04 - 2001/03 International Christian University, Division of Languages, Associate Professor
- 1996/04 - 1998/03 University of Tokyo, Part-time Lecturer
- 1996/04 - 1998/03 Toyo Gakuen University, Professor
- 1992/04 - 1996/03 Toyo Gakuen University, Associate Professor
- 1989/04 - 1994/03 Chuo University, Part-time Lecturer
- 1991/04 - 1992/03 Toyo Woman's College, Assistant Professor
- 1989/04 - 1991/03 International Education Center, Instructor
- 1985/08 - 1986/05 University of Pennsylvania, Intensive English Communication Program, Part-time Lecturer
- 1982/05 - 1984/08 Pennsylvania State University, Center for ESL
- 1980/08 - 1982/05 University of Texas at El Paso, Linguistics Department, Part-time Lecturer