Esperanza Alfonso, Ph.D. (1998, Universidad Complutense, Madrid) is Researcher at the Center for Human and Social Sciences (CSIC). She has published monographs and collective works in the field of medieval Jewish cultural history.Javier del Barco, Ph.D. (2001, Universidad Complutense, Madrid) is Researcher at the Center for Human and Social Sciences (CSIC). He has published monographs and articles on various aspects of Hebrew linguistics, medieval Jewish manuscript culture, and Hebrew codicology.