On this episode I speak with Professor Keramet Reiter about supermax prisons. Professor Reiter is the author of the book 23/7,the first comprehensive history of the origins of the modern supermax, or supermaximum security prison, and the co-editor of the Extreme Punishment anthology. She is an assistant professor in the Department of Criminology, Law and Society and at the School of Law at the University of California, Irvine.