We are pleased to be publishing this translation of selected documents of Volume 16 of The Collected Papers of Albert Einstein, the companion volume to the annotated, original-language documentary edition. As we have stated in all earlier volumes, these translations are not intended for use without the documentary edition, which provides the extensive editorial commentary necessary for a full historical and scientific understanding of the source documents. The translations strive first for accuracy, then literariness, though we hope that both have been achieved. The documents were selected for translation by the editors of The Collected Papers of Albert Einstein. We thank Jennifer Nollar James, William D. Brewer, and Steven Rendall for their dedication in making Einstein’s writings and correspondence available to the English-speaking world Diana Kormos Buchwald for her revisions and the production of camera-ready copy A. J. Kox, Ze’ev Rosenkranz, and Sini Elvington for creating the index. Many thanks to Beth Gianfagna for her careful copyediting of the manuscript, and to Terri O’Prey for seeing it all to completion. Finally, we are most grateful to the National Science Foundation, Grant No. SES-1555639, for their support of our project. Princeton University Press November 2020 PUBLISHER’S FOREWORD