This book contains fifteen original papers covering, a broad spectrum of topics in Jewish demography and identity, considering both Diaspora communities and the population of Israel. While most of the papers make use of quantitative data, some base themselves on qualitative and archive materials. The book is divided into five parts, reflecting the different complementary dimensions investigated: historical demography, history, and politics, immigration and immigrant adaptation, transnationalism, and demography and identity. This work is presented to Professor Sergio Dellapergola upon his retirement from teaching at the Hebrew University of Jerusalem.This is a rich and varied collection of essays, many of which complement one another. Each of them succeeds in advancing the field to which Sergio DellaPergola has contributed so much and influenced so extensively.Eli Lederhendler is the Stephen S. Wise Professor of American Jewish History and Institutions at the Hebrew University of Jerusalem, where he teaches in the Jewish History and Contemporary Jewry Department. He has been the head of the School of History in the Humanities Faculty at the Hebrew University, and has also taught at Yale University, University College London, and Vassar College. His publications in the field of Jewish history span the 19th and 20th centuries, with a focus on Jewish politics, migration, urbanization, and ethnicity. He is co-editor of the annual series, Studies in Contemporary Jewry.. . . Readers who are familiar with Professor DellaPergolas work will see his influence clearly throughout this volume. The chapters are thoughtful, nuanced, and well-researched, and, like DellaPergolas long list of publications, tackle diverse subject matter across the Jewish communities of many nations. This book is a fitting tribute to a dynamic researcher and teacher, and scholars of the Jewish community are fortunate that DellaPergolas work and that of his colleagues and students will continue to belƒ=