Emilio Segrè was an Italian-American physicist born on February 2, 1905, in Tivoli, Italy. He is best known for his work in nuclear physics and for co-discovering the element plutonium in 1940. Segrè played a significant role in the Manhattan Project, which developed the first atomic bombs during World War II. In 1959, Segrè was awarded the Nobel Prize in Physics for his discovery of the antiproton, a subatomic particle that is the antimatter counterpart of the proton. He later became a professor at the University of California, Berkeley, where he continued his research until his death on April 22, 1989.