Tina Rosenberg is a Pulitzer Prize-winning journalist and author. She co-authors the Fixes column in The New York Times. 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 and is author, most recently, of Join the Club: How Peer Pressure Can Transform the World.