1965	Faculty of Engineering , the University of Tokyo
1971	Graduate School of Engineering , the University of Tokyo
1976	Associate Professor , Faculty of Engineering , Nagoya University
1988	Professor, Faculty of Engineering , Nagoya University
1991	Professor, Faculty of Engineering , the University of Tokyo
1995	Professor, Graduate School of Engineering , the University of Tokyo
1999	Professor, Graduate School of Frontier Sciences , the University of Tokyo
2002	Vice - Minister for Policy Coordination, Ministry of Public Management, Home Affairs, Posts and Telecommunications
2003	Senior Advisor, Ministry of Public Management, Home Affairs, Posts and Telecommunications