He has been appointed Order of the Star of Italian Solidarity by the President of Italy in recognition of his writing on Italian history, especially Sicilian history, and he has also written about Spain, particularly the Balearic islands. He has shown an interest in the economic history of the Mediterranean, and in the meeting of the three Abrahamic faiths in the Mediterranean. Not confining himself to the Mediterranean, he has also written a much-praised book on the first encounters between western Europeans and the native societies of the Atlantic (the Canary islands, the Caribbean and Brazil) around 1492; this book is "The Discovery of Mankind: Atlantic Encounters in the Age of Columbus" (2008).