Ross King is the author of the bestselling Brunelleschi's Dome and Michelangelo & the Pope's Ceiling, as well as the novels Ex-Libris and Domino. He lives in England, near Oxford.
Anja Grebe teaches art history at the University of Erlangen- Nuremberg/Germany. She is taking part in numerous international research projects and exhibitions and has published extensively on medieval and modern art history. Grebe is the author of The Louvre: All the Paintings and The Vatican: All the Paintings. She lives in Erlangen, Germany.