Javier Castaño is a research fellow in Jewish history at the Spanish National Scientific Research Council in Madrid. He is a former editor of the journal 'Sefarad'.

Talya Fishman is Associate Professor of Jewish Intellectual and Cultural History of the Medieval and Early Modern Periods at the University of Pennsylvania. She is the author of 'Becoming the People of the Talmud: Oral Torah as Written Tradition in Medieval Jewish Cultures' (2013).

Ephraim Kanarfogel is E. Billi Ivry University Professor of Jewish History, Literature and Law at Bernard Revel Graduate School of Jewish Studies, Yeshiva University. His books include 'Between Rashi and Maimonides: Studies in Medieval Jewish Thought, Literature, and Exegesis' (2010) and 'The Intellectual History and Rabbinic Culture of Medieval Ashkenaz' (2012).

The origins of Judaism's regional 'subcultures' are poorly understood, as are Jewish identities other than 'Ashkenaz' and 'Sepharad'. Through case studies and close textual readings, this volume illuminates the role of geopolitical boundaries, cross-cultural influences, and migration in the medieval formation of Jewish regional identities.