Ann Pizzorusso (US) is a professional geologist and a Renaissance scholar whose work focuses on Leonardo da Vinci as a geologist. She has written numerous scholarly articles on Leonardo and his students, and the artists who preceded and followed him, analyzing the use of geology in their works. Her landmark article, “Leonardo’s Geology: The Authenticity of The Virgin of the Rocks” compared the two versions of the paintings. Demonstrating geology as a diagnostic tool – which was in fact Leonardo’s trademark – she will attribute only one of the two versions to Leonardo. Her new, four gold medals-winning book, Tweeting Da Vinci, discusses how the geology of Italy has influenced its art, literature, religion, medicine.