James Cronin

James Watson Cronin (September 29, 1931 – August 25, 2016) was an American nuclear physicist. Cronin and co-researcher Val Logsdon Fitch were awarded the 1980 Nobel Prize in Physics for a 1964 experiment that proved that certain subatomic reactions are not the same as to fundamental symmetry principles (called CP violation).
Cronin died on August 25, 2016 in Saint Paul, Minnesota at the age of 84.