Joel Henry Hildebrand; John Clarke Slater; Edward Uhler Condon; Lee Alvin DuBridge; Albert Wallace Hull; and Vannevar Bush, , Smithsonian Institution Archives, Front row, left to right: Joel Henry Hildebrand (1881-1983), Professor of Mathematics, University of California at Berkeley; John Clarke Slater (1900-1976), Chairman of the Department of Physics, Massachusetts Institute of Technology; Edward Uhler Condon (1902-1974), Director, U.S. National Bureau of Standards; Lee Alvin DuBridge (1901-1994), President of the California Institute of Technology; Albert Wallace Hull (1880-1966), General Electric Research Laboratory; and Vannevar Bush (1890-1974), President of the Carnegie Institution of Washington. The men were attending a meeting of the National Academy of Sciences, May 1947..