A historian focusing on the medieval era, he was recently Directeur d’ètudes invité at the École des Hautes Etudes en Sciences Sociales in Paris. He has lectured in Medieval Mediterranean History at Northwestern University in Evanston, Chicago, and has worked at the Istituto Storico Italiano per il Medioevo. He currently works for CNR’s Istituto di Storia dell’Europa Mediterranea and teaches Medieval History at the University of Aquila.
He is the author of numerous essays on medieval society and economics in southern Italy, and his recent publications include; "Napoli 1343. Le origini medievali di un sistema criminale", Mondadori (2015); and for Laterza, "Sotto il segno del leone. Storia dell’Italia musulmana" (2011); "Dalle lacrime di Sybille, Storia degli uomini che inventarono la banca", (2013); "Storia del Mediterraneo in 20 oggetti" (with A. Vanoli, 2018); "Storia del mondo. Dall’anno 1000 ai giorni nostri" (with F. Canale Cama and L. Mascilli); he has also contributed to the "Storia mondiale dell’Italia" (edited by A. Giardina).