Hideki Yukawa
In 1929, he returned to Japan, where he endeavored to foster an environment for the study of quantum mechanics. He established Nishina Laboratory at RIKEN in 1931, and invited some Western scholars to Japan including Heisenberg, Dirac and Bohr to stimulate Japanese physicists. It was also in 1931 that he lectured about the Direc theory in Kyoto, which was where he met and was attended by Hideki Yukawa and Sin-Itiro Tomonaga.