Consistent with Youth Participatory Action Research, the Young Adult Advisory Board (YAB) co-developed this study and will continue to be involved in its execution and results dissemination. All have been enthusiastic about the project’s potential to advance knowledge related to the community participation of older youth and young adults with SMHC from marginalized backgrounds and thereby inform interventions, systems, and policies. The YAB will meet at least quarterly throughout the project, and those involved in data collection and analysis will meet more frequently. The team includes two YAB Co-Investigators who will share decision-making responsibilities with the investigative team.