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Segr̬ photographed in his lab, 1954. Emilio Gino Segr̬ (February 1, 1905 - April 22, 1989) was an Italian-American physicist and Nobel laureate who discovered the elements technetium and astatine, and the antiproton, a sub-atomic antiparticle, for which he was awarded the Nobel Prize in Physics in 1959. From 1936 to 1938 he was Director of the Physics Laboratory at the University of Palermo. In 1938, Benito Mussolini's fascist government passed anti-Semitic laws barring Jews from university positions. The Berkeley Radiation Lab, in California, offered him a job as a Research Assistant. While at Berkeley, he helped discover the element astatine and the isotope plutonium-239, which was later used to make the Fat man atomic bomb dropped on Nagasaki. From 1943 to 1946 he worked at the Los Alamos National Laboratory as a group leader for the Manhattan Project. In 1944, he became a naturalized citizen of the United States. On his return to Berkeley in 1946, he became a professor of physics and of history of science, serving until 1972. Segr̬ and Owen Chamberlain were co-heads of a research group at the Lawrence Radiation Laboratory that discovered the antiproton, for which the two shared the 1959 Nobel Prize in Physics. In 1974 he returned to the University of Rome as a professor, but served only a year before reaching the mandatory retirement age. He died of a heart attack at the age of 84 while out walking near his home in Lafayette, California.
