Across the country, people in many jurisdictions who frequently encounter criminal justice, behavioral health, and social service systems are experiencing behavioral health crises and require different levels and intensities of services. This three-part series features three Stepping Up Innovator Counties that are also MacArthur Foundation Safety and Justice Challenge sites. Representatives from these sites provide information on how to effectively serve and increase engagement with people who frequently cycle in and out of jails, emergency departments, homeless shelters, and other community-based settings. This session provides an overview of engagement challenges in service and treatment and strategies for how to work through them at both at the individual and systems levels.