Professor Sato published a paper advocating cosmic inflation in 1981, but it was not widely recognized by Western academic circles.

Since he was a graduate student, Sato has been conducting research on supernovae, following the advice of his mentor, Chushiro Hayashi.

Sato has served as a research assistant at Kyoto University, a visiting professor at the Nordic Institute for Theoretical Physics, an associate professor/professor at the University of Tokyo, the Chairman of 47th Committee of the International Astronomical Union, and the president of the Physical Society of Japan.

"[6] JAXA Space Information Center describes it as follows: Katsuhiko Sato published his theory of inflation in 1981.

[7] Sato studied under the world-renowned astronomer Chushiro Hayashi, who was a student of Hideki Yukawa, Japan's first Nobel Prize winner.