Masatoshi Koshiba is Regent Lecturer at the University of California, Riverside.

Masatoshi Koshiba is Distinguished Visiting Professor at the University of Chicago.

Masatoshi Koshiba is Alexander von Humboldt Preistrager at DESY in Hamburg, Max Planck Institute for Nuclear Physics in Heidelberg, and Max-Planck Institut fur extraterrestrische Physik in Garching.

Masatoshi Koshiba is Distinguished Visiting Scholar at George Washington University.

Masatoshi Koshiba is born in Toyohashi, Aichi.

After building a larger, more sensitive detector named Super-Kamiokande, which starts operating in 1996, Koshiba finds strong evidence that neutrinos, of which three types are known, change from one type into another in flight. The Super-Kamiokande Collaboration announces the first evidence of neutrino oscillation in 1998. This is the first experimental observation supporting the theory that the neutrino has non-zero mass.

Masatoshi Koshiba remains at the University of Tokyo for the next 17 years until 1987. During his tenure, he serves as Director of the Laboratory of High Energy Physics (1974-1976); as Director of the Laboratory for International Collaboration on Elementary Particle Physics (1976-1984); and as Director of the International Center for Elementary Particle Physics (1984-1987). He is honourably assigned as Professor Emeritus of the University of Tokyo in 1987.

Masatoshi Koshiba obtains his master at University of Tokyo.

Koshiba builds an underground neutrino detector in a zinc mine, called Kamiokande II, a huge water tank surrounded by electronic detectors to sense flashes of light produced when neutrinos interact with atomic nuclei in water molecules. He confirms Raymond Davis Jr's results—that the Sun produces neutrinos and that fewer neutrinos are found than expected (a deficit called solar neutrino problem). In ‘87 Kamiokande also detects neutrinos from a supernova explosion outside the Milky Way.

Masatoshi Koshiba is Sherman Fairchild Distinguished Scholar at the California Institute of Technology.

Masatoshi Koshiba receives one forth of the Nobel Prize in Physics along with Raymond Davis Jr. "for pioneering contributions to astrophysics, in particular for the detection of cosmic neutrinos." The other half of the prize goes to Riccardo Giacconi for his work on the cosmic sources of X rays.

While on leave from the University of Tokyo, Masatoshi Koshiba is a Senior Research Associate with the honorary rank of Associate Professor and Acting Director of the Laboratory of High Energy Physics and Cosmic Radiation at the University of Chicago.

Masatoshi Koshiba is Visiting Professor at DESY and University of Hamburg.

Masatoshi Koshiba becomes Director of the Washington Liaison Office of the Japan Society for Promotion of Science.

Masatoshi Koshiba is appointed Associate Professor at the Department of Physics, Faculty of Science, University of Tokyo.

Masatoshi Koshiba conducts research in the Department of Physics at the University of Chicago as a Research Associate.

Masatoshi Koshiba returns to the University of Tokyo to work as an Associate Professor at the Institute of Nuclear Study.

Masatoshi Koshiba is Councilor for the International Center for Elementary particle Physics at University of Tokyo.

Masatoshi Koshiba is Guest Professor at CERN.

Masatoshi Koshiba attends the University of Rochester where he earns his Ph.D. in physics with a dissertation on Ultra-High- Energy Phenomena in Cosmic Rays.

Masatoshi Koshiba majors in physics at the University of Tokyo.

Masatoshi Koshiba becomes Professor of Tokai University until 1997.