Bachelor, Kyoto University, Japan, 1968. Master, Kyoto University, 1970. Doctor of Philosophy, Kyoto University, 1973.
Postdoctoral fellow University Tokyo, 1973—1976. Instructor University Tokyo Institute Space and Astronautical Science, 1975—1987, associate professor, 1987—1988, Nagoya University, Japan, 1988—1991. Professor Kyoto University, since 1991.
Member expert panel astronomy Science Council Japan, division 4, since 1994, member expert panel physics, since 1999, member expert panel space science, since 2001. Member committee of United States-Japan joint research projects Japan Society for Advancement of Science, 1999—2000. Member committee space science progressive Japan Space Forum, since 2000.
Member of International Union Physics and Applied Physics (member commission astrophysics since 1998), International Astronomical Union, Physical Society Japan, Astronomical Society Japan (councilor since 1996, vice president 1999—2000, Hayashi Chusiro prize 1998, prize for excellent paper 1999).