With All Due Modesty: The Selected Letters of Fanny Goldstein is an annotated edition of the correspondence of Fanny Goldstein (1895–1961), librarian, social activist, and founder of Jewish Book Week. Goldstein’s accomplishments include building a significant collection of Judaica for the Boston Public Library; compiling some of the earliest bibliographies of Jewish literature in English; evaluating manuscripts for publishers; writing book reviews; and lecturing and writing on a wide range of subjects related to Jews and Judaism. The purpose of the edition is to provide a picture of Goldstein’s life as a Jew, a woman, a librarian, and a social activist and in so doing, to contribute to a more complete understanding of Boston’s Jewish community in the first half of the twentieth century. I have included in the edition both incoming and outgoing letters with a wide range of correspondents, including Charles Angoff, Mary Antin, Isaac Asimov, Alice Stone Blackwell, Felix Frankfurter, Molly Picon, Ellery Sedgwick, and Friderike Zweig. The letters span the years from 1930 to 1960. The edition includes extensive annotation based on Goldstein’s newspaper and magazine articles, pamphlets, book reviews, and other writings; hundreds of Goldstein’s letters not published here; accounts published in the Jewish press and the mainstream press; and correspondence neither written nor received by Goldstein but bearing on her life and work.