- 1953 December / Born in Kochi Prefecture
- 1966 March / Saga elementary school (in Saga-cho ;now of Kuroshio-cho) graduation
- 1972 March / Tosa High School graduation
- 1976 March / Completed the Department of Reaction Chemistry and Science at the Faculty of Engineering, the University of Tokyo
- 1978 March / Completed Master course of Reaction Chemistry from the University of Tokyo Graduate School of Engineering
- 1978 April / Joined JGC Corporation
- 2002 July / General Manager of HSE Systems Division, JGC Corporation
- 2006 July / Chief Engineer of HSE in JGC
- 2014 April / Contract Employee of JGC Corporation after retirement
- 2014 September / Anti-Tsunami Laboratory
- 2015 October / Retired from Contract Employee of JGC Corporation
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April 2017, Keihan Train Nakashojima Station
(The nearest station to Ujigawa Open Laboratory, Kyoto University Disaster Prevention Research Institute)
Photo of Ryoma and I.