Amy Chua is the John M. Duff, Jr. Professor of Law at Yale Law School, where she has taught since 2001. She writes on the intersection of law, ethnicity, and political power; her earlier works include World on Fire and Day of Empire. In Political Tribes she argues that American foreign policy has repeatedly failed by ignoring the tribal loyalties — ethnic, religious, and clan-based — that drive political behaviour around the world, and that an analogous tribalism is now fracturing domestic politics. She was named one of Time magazine's 100 most influential people in the world.