John Francis Clauser is an American theoretical and experimental physicist known for contributions to the foundations of quantum mechanics, in particular the Clauser-Horne-Shimony-Holt inequality. Clauser received his B.S. in physics from the California Institute of Technology in 1964. He received his M.A. in physics in 1966 and his Ph.D. in physics in 1969 from Columbia University. From 1969 to 1996 he worked mainly at Lawrence Berkeley National Laboratory, Lawrence Livermore National Laboratory, and the University of California, Berkeley. He was a member of the Berkeley Fundamental Fysiks Group, founded in May 1975 by Elizabeth Rauscher and George Weissmann, an informal group of physicists who met weekly to discuss philosophy and quantum physics. Clauser was awarded the Wolf Prize in Physics in 2010 together with Alain Aspect and Anton Zeilinger. In 1972, working with Stuart Freedman, he carried out the first experimental test of the CHSH-Bell's theorem predictions. This was the world's first observation of quantum entanglement, and was the first experimental observation of a violation of a Bell inequality. 

December 1st, 1942 in Pasadena (Age 81)