Emilio Segre, Italian-born physicist who in 1959 shared the Nobel Prize for physics with Owen Chamberlain for their 1955 discovery of the antiproton. Segre (born 1905) worked under Enrico Fermi in Italy in the 1920s and 30s. He emigrated to the US in 1938 & worked in Ernest Lawrence's Radiation Laboratory at Berkeley, California. It was there that he & Chamberlain discovered the antiproton. The laboratory was later renamed the Lawrence Berkeley Laboratory. This portrait of Segre was taken at his home in Lafayette, Califor- nia, in June 1984.