Mas Oyama
In April 1964, Mas Oyama established the Kyokushin Kaikan of the International Karatedo Federation under the umbrella of the Kyokushin Scholarship Foundation. Upon formation, Eisaku Sato acted as chairman and Matsuhei Mori as the vice chairman, with Oyama as the director (later president). Oyama directed the organization through a period of expansion. In June of the same year, the headquarters dojo (later the general headquarters) was completed in Nishiikebukuro, Toshima-ku, Tokyo. In addition to the people who provided financial support for the construction, Tadashi Nakamura testified that "Kenji Kurosaki's teacher has contributed very much."