Born in Japan, 1961.
..................
Graduated from Dept. of Info. Sci., Tokyo Institute of Technology, 1984.
Master of Science, 1986 (Tokyo Institute of Technology).
Doctor of Science, 1989 (Tokyo Institute of Technology).
..................
Research Associate at Dept. of Info. Sci., Tokyo Institute of Technology, 1989.
Lecturer at Dept. of Comp. Sci. and Info. Math., University of Electro-Communications, 1993.
Associate Professor at Dept. of Comp. Sci. and Info. Math., University of Electro-Communications, 1994.
Associate Professor at Research Institute for Mathematical Sciences, Kyoto University, since 1999.
Full Professor at Department of Mathematics, Keio University, since 2004.