Born at Yamaguchi City
1981, March: Graduated from Faculty of Science and Engineering, Waseda University
1983, March: Master of Science (Waseda University)
1988, February: Doctor of ScienceiWaseda Universityj
1986, April - 1988, March : Research Associate, Faculty of Science and Engineering, Waseda University
1988, April - 1993, March : Research Associate, Faculty of Education(current name is Faculty of Education and Human Sciences), Yokohama National University
1991,June - 1991, August: Visiting Researcher, Department of Mathematics, The University of Liverpool
1991, September - 1992, March: Visiting Researcher, Department of Mathematics, University of North Carolina at Chapel Hill
1994, July - 1994, September : Visiting Researcher, Mathematics Institute, University of Sao Paulo at Sao Carlos
1993, April - 1997, September : Associate Professor, Faculty of Education(current name is Faculty of Education and Human Sciences), Yokohama National University
1997, October - 2006, March : Associate Professor, Faculty of Education and Human Sciences, Yokohama National University
2006, April - 2011, March : Professor, Faculty of Education and Human Sciences, Yokohama National University
2011, April - present : Professor, Research Institute of Environment and Information Sciences, Yokohama National University