Leó Szilárd
During these crucial years, a number of the most prominent European scientists, especially physicists, immigrated to the United States, where they would do much of their most important work; these included Hans Bethe, Albert Einstein, Enrico Fermi, Leó Szilárd, Edward Teller, Felix Bloch, Emilio Segrè, John von Neumann, and Eugene Wigner, among many, many others. American academics worked hard to find positions at laboratories and universities for their European colleagues.