Ken M. Fritz, Ph.D., is a Research Ecologist in the Ecological Exposure Research Division, National Exposure Research Laboratory within the United States Environmental Protection Agency’s Office of Research and Development in Cincinnati, Ohio. Ken’s interest in intermittent streams began with his graduate research when he studied the response and recovery of biological assemblages to drying and forestry practices. Among the projects Ken has led since joining the USEPA has been a nationwide study to characterize the physical and biological features of headwater streams across a gradient of flow permanence. The intent of this research has been to provide scientific information that may inform policy decisions regarding the scope of jurisdictional waters under the Clean Water Act. Additionally, this research lays the foundation for critically assessing the ecological integrity of intermittent and ephemeral streams, which represent a significant proportion of stream miles in the United States.