Research Experience
- 
2000--早稲田大学大学院国際情報通信学科(GITS)教授・委員長 
- 
2000--Professor , Graduate School of Global Information and Telecommunication Studies GITS, 
- 
1998-- 早稲田大学国際情報通信研究センター(GITI)所長 
- 
1998--Director,Global Information and Telecommunication Institute, 
- 
1990-1996郵政省郵政研究所研究官 
- 
1990-1996Institute for Posts and Telecommunications Policy, 
- 
1978-1979英国エセックス大学訪問教授 
- 
1978-1979University of Essex, Visiting Professor 
- 
1976-1978東北大学電気通信研究所流動研究員 
- 
1976-1978Study Groups on Electrical Communication, 
- 
1976-- 早稲田大学理工学部教授 
- 
1976-- Waseda University, Professor 
- 
1971-1976Waseda University School of Science and Engineering 
- 
1971-1976Waseda University, Associate Professor 
- 
1964-1971日本電信電話公社勤務 
- 
1964-1971Nippon Telegraph and Telephone corporation 
- 
Waseda University, 
- 
Researcher 
- 
Tohoku University, Researcher 
