This dissertation examines the birth of the supermax in Arizona and California, and the spread of the institutional innovation across the United States. The research presented here draws on three major categories of data: archival materials, including legal decisions and case files, local news reporting, and legislative records; oral history interviews with more than thirty key informants, including correctional administrators, legal professionals, architects, and former prisoners; and quantitative data maintained by the California Department of Corrections and Rehabilitation.