Val Logsdon Fitch

Val Logsdon Fitch (born March 10, 1923, Merriman, Nebraska, USA) is an American nuclear physicist. A native of Merriman, Nebraska, he graduated from Gordon High School and attended Chadron State College for three years before being drafted into the U.S. army in 1943. He later graduated from McGill University with a bachelor's degree in electrical engineering in 1948 and completed his Ph.D. in physics in 1954 from Columbia University. In World War II, he worked on the Manhattan Project in Los Alamos. He is a member of the faculty at Princeton University.

Fitch and co-researcher James Watson Cronin were awarded the 1980 Nobel Prize in Physics for a 1964 experiment using the Alternating Gradient Synchrotron at Brookhaven National Laboratory that proved that certain subatomic reactions do not adhere to fundamental symmetry principles. Specifically, they proved, by examining the decay of K-mesons, that a reaction run in reverse does not merely retrace the path of the original reaction, which showed that the reactions of subatomic particles are not indifferent to time. Thus the phenomenon of CP violation was discovered.

Fitch is a member of the Board of Sponsors of The Bulletin of the Atomic Scientists.