The editors have benefited greatly from the assistance of many individuals and institutions. We extend our thanks to the members of the Executive Committee, and wish to thank The Hebrew University of Jerusalem for granting us permission to publish materials from its holdings. The ongoing support of the Harold McGraw, Jr., endowment is deeply appreci- ated. Generous assistance was provided by the California Institute of Technology and by the Virgle L. Hedgcoth and Susan Alexander Fund. We gratefully acknowledge grant support from the National Science Foundation and the National Endowment for the Humanities. We owe profound thanks to Barbara Wolff for her dedicated and meticulous as- sistance in proofreading numerous documents in this volume, as well as to Chaya Becker and director Roni Grosz at the Albert Einstein Archives at The Hebrew University in Jerusalem for their sustained assistance and generous cooperation. Tilman Sauer and Robert J. Schulmann reviewed the manuscript and gave us significant and helpful feedback. Yemima Ben-Menahem, John L. Heilbron, and John D. Norton saved us from some blunders. We thank Matthias Schwerdt, and the staff of the Max Planck Institute for the History of Science for assisting us with important literature searches. We also thank the staff of the Swiss Federal Institute of Technology Library, and the University of Zurich Archive for their continued assistance in examining Einstein-related materials. Much detailed historical information was needed in the scholarly annotation of the documents presented in this volume. We gratefully thank the following persons for their assistance: Brigitta Arden, University of Pittsburgh Library Benvenuto Bandi, Burgdorf, Switzerland Anat Banin, Central Zionist Archives, Jerusalem Karin Beck, Stadtarchiv Zürich, Zurich Priska Bietenhader, Stadt Wetzikon, Switzerland Linda Brunschweiler, Zivilstandsamt Männedorf, Switzerland Peter Exner, Landesarchiv Baden-Württemberg, Karlsruhe Yaron Ezrahi, Hebrew Uni- versity of Jerusalem Gudrun Föttinger, Bernisches Historisches Museum, Bern László Futó, Óbuda University, Székesfehérvár, Hungary Stephanie Gropp, Burgerbibliothek, Bern Siegfried Grundmann, Berlin Marlis Günther, Archiv der ACKNOWLEDGMENTS