| Aug. 1984 |
Research Assistant, the Information Processing Center, Tokyo Institute of Technology |
| Mar. 1987 |
Obtained Ph.D. in engineering |
| Apr. 1987 |
Research Assistant, Information Technology Center, University of Tokyo |
| Apr. 1990 |
Assistant Professor, Faculty of Environmental Information, Keio University |
| Apr. 1997 |
Professor, Faculty of Environmental Information, Keio University (to present) |
| Jun. 1999 |
Director of SOFTBANK CORP. (to present) |
| May 2005 |
Executive Director, Keio University (to present) |
| Apr. 2007 |
Director, SKY Perfect JSAT Corporation (currently SKY Perfect JSAT Holdings Inc.) (to present) |
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