ACKNOWLEDGMENTS l x i i i
Zurich Archive, without whose assistance much of the documentation from Swit-
zerland could not have been assembled.
The assistance of the following persons is also gratefully acknowledged: Helena
Andres, Görres-Gesellschaft zur Pflege der Wissenchaft, Bonn; Brigitta Arden,
Archives of Scientific Philosophy, Pittsburgh; Ralf Bülow, Landesmuseum für
Technik und Arbeit, Mannheim; Barbara Bürki and Maria Lauper Eggimann, Ein-
stein-Haus, Bern; Lukas Dettweiler, Schweizerisches Literaturarchiv, Bern; Philip
Cronenwett, Burndy Library, The Dibner Institute, Cambridge, Massachussetts;
Esther Dreifuss-Kattan, Southern California Psychoanalytic Institute, Los Ange-
les; Michael Eckert, Sommerfeld Edition, Deutsches Museum, Munich; Jean
Eisenstaedt, CNRS, Paris; Ralph Elliott, Humanities Research Centre, Australian
National University; Brigitte Faatz, Stadtarchiv, Bad Nauheim; Peter Fleer, Swiss
Federal Archive, Bern; Philippe Frei, State Archive of the Canton of Zurich; Robert
Marc Friedman, University of Oslo; Bernd Goebel, Theological Faculty, Fulda;
Hubert Goenner, University of Göttingen; Branko Hanz=ek, Institute for the History
and Philosophy of Science, Croatian Academy of Sciences and Arts; Klaus
Hentschel, University of Bern; Gerald Holton, Harvard University; Diederik Hum-
melinck, Amsterdam; Sanja Ilic, Caltech; Christian Huber, Swiss Social Archive,
Zurich; Miriam Intrator, Leo Baeck Institute, New York City; Mathias Iven, Lon-
don; Nils Voje Johansen, University of Oslo; Toontje Jolles, Nationaal Archief, The
Hague; Helge Kragh and Anita Kildebaek Nielsen, University of Aarhus; Andreas
Kleinert, Martin-Luther-Universität, Halle-Wittenberg; Adelheid König and
Friedrich Stadler, Vienna Circle Archive, Vienna; Christoph Lehner, Max Planck
Institute for the History of Science, Berlin; Nurit Lifshitz, Kfar Saba, Israel; Ad
Maas, Museum Boerhaave, Leyden; Director Wolfgang Maderthaner, and
Michaela Maier, Society for the History of the Labor Movement, Vienna; Wolf-
Dieter Mechler, Historisches Museum am Hohen Ufer, Hannover; Christine Nel-
son, Pierpont Morgan Library, New York City; Sara Palmor, Jerusalem; Felicity
Pors, Niels Bohr Archive, Copenhagen; Margrit Prussat, Archiv des Deutschen
Museums, Munich; Yukiko Sakabe, Archive of the Austrian Academy of Sciences,
Vienna; Dietmar Schenk, Director of the University Archives, University of the
Arts, Berlin; Heinrich Schuler, Gemeinde Winterlingen; Joke Schuller, Universi-
teitsmuseum Utrecht; Ana Simoes, University of Lisbon; Wolfgang Unkel, Bad
Nauheim; Ildikó Varga, National Széchényi Library, Budapest; Vladimir P. Vizgin,
Institute of History of Science and Technology of the Russian Academy of Sci-
ences, Moscow; Viola Voss, Leo Baeck Institute, New York City; Barbara Welker,
Stiftung Neue Synagoge Berlin, Centrum Judaicum, Berlin; Hans-Jürgen Wendel
and Olaf Engler, University of Rostock; Jocelyn K. Wilk, University Archives &