James Hall is an art historian, critic and lecturer. His many books include The Self-Portrait : a Cultural History (2014). Thomas Marks is a writer and critic who is an associate fellow of the Warburg Institute, London. Martina Mazzotta is an art historian and curator who is a visiting fellow and a member of the Visionary Circle for the Warburg Institute, London. Marco Pasi is Director of the Centre for Hermetic and Related Studies at the University of Amsterdam.