March 1980, B.Sc University of Tokyo

March 1982, M.Sc University of Tokyo

March 1985, D.Sc. University of Tokyo

April 1985, Postdoctoral Fellow, Japan Society for the Promotion of Science ( KEK)

September 1985, Research Fellow, Department of Physics, University of Michigan

September 1987, Research Associate, Department of Physics and Astronomy, University of  North Carolina at Chapel Hill  

January 1989, Assistant Professor, Department of Physics, Tohoku University

December 1992, Associate Professor, Department of Physics, KEK

July 2000, Professor, Institute of Particle and Nuclear Studies, KEK