Masatoshi Koshiba

was a Japanese physicist. He was known as one of the founders of Neutrino astronomy. He won the Nobel Prize in Physics with Raymond Davis, Jr. in 2002.
He was Senior Counselor of International Center for Elementary Particle Physics (ICEPP) and Emeritus Professor of University of Tokyo. 
Koshiba died on November 12, 2020 in Tokyo at the age of 94.