Barton Gellman, a Pulitzer Prize- and Emmy Award-winning journalist, is a staff writer at The Atlantic and a senior fellow at the Century Foundation. He previously served tours as legal, military, diplomatic and foreign correspondent for The Washington Post. His bestselling “Angler: The Cheney Vice Presidency” won the Los Angeles Times Book Prize and was a New York Times Notable Book of 2008. Gellman’s newly published book, “Dark Mirror: Edward Snowden and the American Surveillance State” (Penguin), is the product of countless hours of direct conversation with Snowden combined with unexpected events resulting from their conversation and years of meticulous research. It is a true-life spy story that explores both the reality of Snowden’s intentions and the wider surveillance-industrial revolution.