The terrorist attacks of 2001 served as a triggering event for the inception of a policy domain focused on homeland security, and with it came a body of research substantively concentrated on public policy addressing the unique challenges presented in the emerging policy domain. Since naissance, policy issues addressing homeland security have been both disparate and highly salient creating a literature that covers topics ranging from measuring vulnerability of populations to denial of service attacks on medical facilities. This article reviews the literature for a description of what Homeland Security policy is (or is not), where the research in public policy broadly defined has improved knowledge or practice, aspects of the policy domain that require development, and the challenges associated with research in this area. We find that broadly speaking, the most productive areas of inquiry in this domain are those that have the least uncertainty-those that migrated as a mature area of research, those based on objective measures, and those with identifiable origins. KEY WORDS: homeland security, policy process, disaster networking, future challenges S34 Policy Studies Journal, 48:S1