Martin Kemp is Emeritus Professor of History of Art at the Oxford University and Member of the British Academy. He has curated several exhibitions dedicated to the work of Leonardo of whom he is one of the greatest international scholars. He has published several books and essays translated all over the world, and he has carried out the most extensive research on the painting La Bella Principessa by Leonardo. Fabio Scaletti is a writer, a scholar of Renaissance art, and an expert on the attributional themes, he is the author of several publications in magazines and volumes. A Caravaggio specialist, he later extended his research to the great masters of the Italian Renaissance, with particular attention to the news of the debate among critics, experts and researchers on the most celebrated works of art history and on the new investigations and discoveries.