| April, 1983 | JSPS  (Japan Society for the Promotion of Science) Postdoctoral Fellow | 
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| November, 1984 | Research Associate, Nuclear Engineering Research Laboratory, The University of Tokyo  (UTokyo) | 
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| November, 1986〜February,1987 | Guest Scientist, LLNL  (Lawrence Livermore National Laboratory), USA | 
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| December, 1984 | Associate Professor, Dept. of Nuclear Engineering, UTokyo | 
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May, 1992〜 February, 1993  | Guest Scientist, KfK  (Currently KIT: Karlsruher Institut für Technologie), Germany | 
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| April, 1999 | Professor, Dept. of Quantum Engineering & Systems Science (Currently Dept. of Nuclear Engineering & Management), UTokyo | 
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| April, 2008 | Director, Institute of Engineering Innovation, UTokyo | 
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| March, 2020 | Retired from UTokyo | 
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| June, 2020 | Emeritus Professor, UTokyo | 
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| August, 2020 | President, The Institute of Applied Energy | 
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