Miles J. Unger is an art critic for The Economist, and has several best-selling books about subjects like Michelangelo and Machiavelli. His most recent book is "Picasso and the Painting that Shocked the World." 

The author's Facebook page can be found at https://www.facebook.com/milesjunger   His personal website is http://www.milesjunger.com/   And his Instagram handle is @heraclitus59