President and Representative Director, YDM　Language　International　Incorporated

   Chief Director, NPO YDM Association

   Representative Director, YDM Institute for Language and Cultural Education

Former Representative Director/Vice President, YDM Language International Holding Ltd.

Former Chief Executive Director, Center for Japanese Language Education [Nihongo Kyoiku Center] (Tokyo, Japan).

Former President, Aoyama Language Academy (Tokyo, Japan).

Former Chief Instructor of Japanese, Intercult School of Japanese (Tokyo, Japan).

Former Lecturer of Summer Program in Japanese, International Christian University (Tokyo, Japan).

Former Lecturer of Japanese for FALCON, Department of Modern Languages, Cornell University (New York, USA).

Former Lecturer of Japanese, Department of Modern Languages, Cornell University (New York, USA).