Toby Lester is a contributing editor to and has written extensively for The Atlantic. A former Peace Corps volunteer and United Nations observer, he lives in the Boston area with his wife and three daughters. His first book, The Fourth Part of the World (2009), about the map that gave America its name, was a finalist for the Barnes & Noble Discover New Writers Award and was picked as a Book of the Year by several other publications. His second book, Da Vinci's Ghost, about Leonardo's famous drawing of a man in a circle and a square, reached the New York Times extended bestseller list. His work has also appeared on the radio program This American Life.