Biography of Chushiro Hayashi(1920-2010) is described with an emphasis on his early career as a theoretical physicist. In spite of his well-recognized achievements in theoretical astrophysics, such as Hayashi phase, p/n-ratio at Big Bang, stellar evolution and nucleosynthesis and Kyoto Model on the origin of solar system, Hayashi had once wished to devote in study of non-local field theory of particle physics. However, the various changes of situation around Hideki Yukawa(Nobel prize laureate in 1949) had guided him to the study of astrophysics.

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