William E. Wallace is the Barbara Murphy Bryant Distinguished Professor of Art History at Washington University in St. Louis and an internationally recognized authority on the great Renaissance artist, Michelangelo Buonarroti. In addition to more than 90 articles and essays, he is the author and editor of seven different books on Michelangelo, including the award-winning, Michelangelo: The Complete Sculpture, Painting and Architecture (1998), Discovering Michelangelo (Rizzoli, 2012), and a biography of the artist, Michelangelo: The Artist, the Man and his Times (Cambridge 2010/paper 2011).
Leonardo can be a slippery subject. He was a multi-faceted artist/scientist, inventor/visionary difficult to grasp in his protean totality. Walter Isaacson, however, is a reliable and voluble guide. This is a good read.