LIST OF ILLUSTRATIONS (Illustrations follow p. 448) 1. Studio portrait, Berlin, 1928. (Courtesy Greg Berger for The Manhattan Rare Book Company, New York) 2. Einstein with his secretary Helen Dukas in the “tower room,” Haberland- strasse 5, Berlin, ca. May 1929. (Courtesy The Albert Einstein Archives, Hebrew University of Jerusalem) 3. Rudolf Kayser and Ilse Kayser-Einstein (second and third from the left), Celerina, Switzerland, ca. January 1928 (Courtesy Rudolf Kayser Archive, The National Library of Israel, Jerusalem) 4. Einstein with Elsa and Margot Einstein, in the Haberlandstrasse 5 apartment, Berlin, ca. January 1928. (Courtesy ullstein bild, Granger, NYC, All Rights Reserved, NY) 5. Fifth Solvay Congress, Brussels, October 1927. Left to right, front row: Irving Langmuir, Max Planck, Marie Curie-Skłodowska, Hendrik A. Lorentz, Einstein, Paul Langevin, Charles-Eugéne Guye, C.T.R. Wilson, Owen W. Richardson. Middle row: Peter Debye, Martin Knudsen, W. Lawrence Bragg, Hendrik A. Kramers, Paul Dirac, Arthur Compton, Louis de Broglie, Max Born, Niels Bohr. Back row: Auguste Piccard, Émile Henriot, Paul Ehrenfest, Édouard Herzen, Théophile de Donder, Erwin Schrödinger, Jules-Émile Verschaffelt, Wolfgang Pauli, Werner Heisenberg, Ralph H. Fowler, Léon Brillouin. (Courtesy The Albert Einstein Archives, Hebrew University of Jerusalem) 6. Einstein and Niels Bohr in Brussels during the Fifth Solvay Congress, October 1927. (Photo by Paul Ehrenfest, courtesy American Institute of Physics, Emilio Segrè Visual Archives, Ehrenfest Collection) 7. Luitzen E. J. Brouwer and Chaim Herman Müntz, International Congress of Mathematicians, Zurich, 1932. (Photo by Johannes Meiner, courtesy ETH- Bibliothek Zurich, Bildarchiv) 8. Arnold Berliner, Zurich, mid-1920s. (Courtesy Archiv der Max-Planck- Gesellschaft, Berlin-Dahlem)