Giampiero Negretti is an eminent watch expert and former editor-in-chief of the Italian newspaper Il Giornale. He has written several books on Panerai including Legendary Watches and Panerai Historia: From the Depths of the Sea. He has co-authored books on other luxury timepieces including Patek Philippe, Piaget Watches and Wonders Since 1874, Masters of Time, Longines Watches, and Le Temps du Cartier.