Joseph Sassoon is Professor of History and Political Economy at Georgetown University, a Senior Associate Member at St Antony's College, Oxford and a Trustee of the Bodleian Library. His ancestors were forcibly separated from the Sassoons of this book early in the nineteenth century, but he is fluent in the languages they spoke and the obscure Judeo-Arabic script - indecipherable to previous historians - they used in their private communications, which are the foundation of this book.