Richard H. Popkin (1923–2005) was a pioneer in the field of Jewish studies. His numerous books and articles broke new ground in the study of Jewish-Christian relations in the early modern period and in the exploration of the impact of Jews and Judaism on philosophy and religious thought. A Sceptical Jew: Richard H. Popkin’s Private Republic of Letters brings together selections from Popkin’s private correspondence and other documents to illuminate the sources of his interests and the nature of his contributions to the fields in which he worked. Jeremy D. Popkin is the William T. Bryan Chair of History at the University of Kentucky (emeritus). He is the son of Richard H. Popkin and the author of A New World Begins: The History of the French Revolution (2019), along with numerous other books on French history, life-writing, and the Haitian Revolution. Asher Salah , Ph.D. (2004), is a professor at the Bezalel Academy of Arts and the Hebrew University of Jerusalem. His scholarship deals with Jewish literature in early modern Italy, Sephardic studies, and Jewish cinema in the Mediterranean area. Among his publications are La Republique des Lettres: Rabbins, écrivains et médecins juifs en Italie au XVIIIe siècle (2007). Giuseppe Veltri is a professor of Jewish philosophy and religion at Universität Hamburg, where he is also the director of the Maimonides Centre for Advanced Studies. Among his publications are Il Rinascimento nel pensiero ebraico (2020), editions and translations of Simone Luzzatto’s Discourse on the State of the Jews (2019, with Anna Lissa) and Socrates, or On Human Knowledge (2019, with Michela Torbidoni), L’ebraismo come scienza: Cultura e politica in Leopold Zunz (2019, with Libera Pisano), and Alienated Wisdom: Enquiry into Jewish Philosophy and Scepticism (2018).