1977-1979 Electron correlation effects on Anderson localization (Theory)
1979-1984 Low dimensional electron systems in III-V semiconductors (Experiment)
1984-1991 Electronic structures of III-V semiconductors (Theory)
1991-1998 Optical properties of III-V semiconductors (Experiment & Theory)
1989-1998 Anormalous nuclear effects in deuterated solids (Experiment)
1998-2003 Science & technology public policy and sociological physics (Social science)
2003- 　　　　Innovation and technology management (Multidisciplinary)
2003-　　　　 Development of nitride semiconductor devices and its industrialization (Multidisciplinary)

1979 - 1986 Research scientist, NTT Electrical Communication Laboratories.
1984 - 1985 Visiting scholar, Department of Physics, University of Notre Dame (U.S.A.) , living in South Bend, Indiana.
1986 - 1990 Senior research scientist, NTT Basic Research Laboratories.
1990 - 1998 Senior research scientist, supervisor, NTT Basic Research Laboratories.
1993 - 1998 Invited scientist, IMRA Europe (France) , living in Cote d'Azur, France.
1999 - 2001 Councilor, The 21st Century Public Policy Institute.
2001 - 2003 Exective senior fellow, The 21st Century Public Policy Institute.
2003 - 2014 Professor, Graduate School of Doshisha University.
2014 - 　　 Professor, Graduate School of Kyoto University.
1998 - 　　　　Founded ArcZone K.K.
2001 - 　　　　Founded Powdec K.K., member of the board.
2005 - 　　　　Founded ALGAN K.K.
2011 -　　　　 Founded CONNEXX SYSTEMS K.K.

The Physical Society of Japan

The Japan Society of Applied Physics

The Academic Association for Organizational Science

The Japan Academic Society for Ventures and Entrepreneurs

The Japan Society for Science Policy and Research Management