Family background; grows up in California; early interest in electronics. Undergraduate and graduate studies at Caltech. Strong interest in history of science as undergraduate. Ph.D. in physics, 1932. University of California at Berkeley, 1932-1934. MIT from 1934; founder of the Radioactivity Center. Starts first course designated "nuclear physics," January 1935. Strong interest in study of radium poisoning; radium tolerance in humans, cancer research. World War II work, postwar work; establishment of Laboratory for Nuclear Science and Engineering. Markle Foundation supplies funds for the Radioactivity Center's Cyclotron; the 1940 Conference on Applied Nuclear Physics (sponsored by the American Institute of Physics and MIT); World War II work at the Radioactivity Center at MIT; radium dial paint studies; radium and plutonium safety regulations (Glenn Seaborg); work relations with the Manhattan Project; the MAMI (marked mine) project reveals indication of German plutonium project. Also prominently mentioned are: Carl David Anderson, Joe Aub, Joe Boyce, Vannevar Bush, Evan Byers, John Cockcroft, Robert Colenko, Arthur Holly Compton, Karl Taylor Compton, Enrico Fermi, Horace Ford, Ralph Howard Fowler, George Gamow, Newell Gingrich, Clark Goodman, Leslie Richard Groves, George Harrison, Hobart, Elmer Hutchisson, Ray Keating, Arthur Kip, Pinkie Klein, Rudolf Ladenburg, Charles Christian Lauritsen, Thomas Lauritsen, Ernest Orlando Lawrence, Gilbert Newton Lewis, Willard Frank Libby, Milton Stanley Livingston, Leonard Benedict Loeb, Sam Lynd, Edwin Mattison McMillan, Robert Andrews Millikan, J. Robert Oppenheimer, Elmer Robinson, Ernest Rutherford, John Clarke Slater, Sorensen, Robert Jamison Van de Graaff, Ernest Thomas Sinton Walton, Martin Wittenberg, Jerrold Reinach Zacharias; American Institute of Physics; American Cancer Society, Bausch and Lomb Co., National Research Council, Radiation Standards Committee, United States Federal Cancer Commission, United States Food and Drug Administration, United States National Bureau of Standards, United States Navy, University of Rochester, University of Utah Salt Lake City Project, Wesleyan University, World War I, and World War II.