ITAKURA Kiyonobu was a Japanese researcher who specialized in the history of science, pedagogy and the history of science education. His eminent career included serving as Director of the National Institute of Education. Itakura was a renowned educational researcher, science historian and thinker. After completing a PhD in Physics at the University of Tokyo, he joined the National Institute of Education where, in 1963, he proposed the Hypothesis-Experiment Class (Kasetsu) model centered on “problems, expectations, discussions and experiments”, with the aim of improving science education in schools. The Hypothesis-Experiment Class system has been implemented in schools around the world. His achievements far exceeded the boundaries of the institute at which he was employed, and he wrote many books and papers even after retirement. He passed away in 2018.