Julian R. Betts is professor of economics and chair of the Department of Economics at the University of California, San Diego. He also serves as a research associate of the National Bureau of Economic Research and an adjunct fellow at the Public Policy Institute of California (PPIC). He is also a member of the National Charter School Research Project's Charter School Achievement Consensus Panel. Paul T. Hill is the John and Marguerite Corbally Professor at the University of Washington Bothell and Director of the Center on Reinventing Public Education. He also chairs the National Charter School Research Project and leads its Charter School Achievement Consensus Panel, which authored the influential paper, Key Issues in Studying Charter Schools and Achievement: A Review and Suggestions for National Guidelines (May 2006).