Academic career
Research associate, Department of Physics
University of Tokyo 1971-1973
Research associate, National Laboratory for High Energy Physics
1973-1978
Assistant professor, Institute of Information Sciences and
Electronics, University of Tsukuba 1978-1982
Associate professor, Institute of Information Sciences and
Electronics, University of Tsukuba 1982-1988
Professor, Institute of Information Sciences and Electronics,
University of Tsukuba 1988-1991
Professor, Department of Information Science,
University of Tokyo 1991-2001
Chairman, Department of Information Science 1991-1996
Professor, Department of Computer Science, University of Tokyo 2001-2006
Professor and Dean, Faculty of Informatics, Kogakuin University 2006-