Tina Rosenberg is a Pulitzer Prize-winning journalist and author. She co-authors the Fixes column in The New York Times “Opinionator” section. Her books include Children of Cain: Violence and the Violent in Latin America and The Haunted Land: Facing Europe’s Ghosts After Communism, which won the Pulitzer Prize and National Book Award. She has written for dozens of magazines, including The New Yorker, Rolling Stone, Foreign Policy and The Atlantic. She is the author, most recently, of Join the Club: How Peer Pressure Can Transform the World.