Yoshio Nishina (仁科芳雄) (December 6, 1890 – January 10, 1951) was the founding father of modern physics research in Japan. He co-authored the well-known Klein–Nishina formula. He was a principal investigator of RIKEN and mentored generations of physicists, including two Nobel Laureates: Hideki Yukawa and Sin-Itiro Tomonaga. During World War II, he was the head of the Japanese atomic bomb program. The crater Nishina on the Moon is named in his honor.