- 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
April 2017, Keihan Train Nakashojima Station
(The nearest station to Ujigawa Open Laboratory, Kyoto University Disaster Prevention Research Institute)
Photo of Ryoma and I.