For most of the 20th century, public employers granted their employees high levels of job security. The 21st century has brought a reversal of fortunes, with emphasis increasingly on at-will employment systems. Both distant and recent policy choices about job security have been based largely on normative and ideological considerations rather than behavioral science evidence. This article synthesizes public-and privatesector job security research to provide a more evidence-based footing for future public job security policy. Although changes related to job security are global, our attention is primarily on the United States. The article reviews job security research with origins in organizational behavior research, at-will employment research, and institutionalization and public trust research across sectors. Based on the review of the literature, we develop an integrative model of job security. We highlight practical implications that flow from the model and discuss future research needs. Keywords job security, job insecurity, at-will employment, employee work attitudes and behavior Job security is a concept of enduring importance in public administration and public management. In his History of the U.S. Civil Service, Paul Van Riper (1958) identified "security of tenure" as one of three defining attributes of the new federal civil service at its inception in 1883 (p. 100). As Van Riper noted, the job security rules introduced