1. Jens Ludwig is the Edwin A. and Betty L. Bergman Distinguished Service Professor, University of Chicago Harris School of Public Policy, Chicago, Illinois. Research Associate, National Bureau of Economic Research, Cambridge, Massachusetts.
2. Sendhil Mullainathan is the Roman Family University Professor of Computation and Behavioral Science, University of Chicago Booth School of Business, Chicago, Illinois. Research Associate, National Bureau of Economic Research, Cambridge, Massachusetts.