Ritsuo Yoshioka is an Emeritus President of the International Thorium Molten-Salt Forum, which is organizing MSR researchers in the world and promoting MSR. He had various experience on BWR design and licensing for 30 years and has been studying MSR since 1993. He also contributed to system safety projects for wide industry area from 1998 to 2010. He also worked as an occasional consultant for IAEA on fuel cycle area since 1991.He published more than 100 papers or articles on BWR and MSR core design and system safety, besides system safety for wide industries. His current research interest is MSR design and development