Individuals with serious mental illness (SMI) experience behavioral excesses and skills deficits that significantly impact their daily functioning. Individuals with SMI are in high need for receiving psychological treatment, making them frequent utilizers of healthcare. Interventions for this population are commonly being implemented within prison, emergency care, and underfunded community mental health settings. Interventions in these environments can be ineffective because providers in these locations may not have appropriate training or access to sufficient resources to provide treatment to this complex population. Due to the frequent and inappropriate utilization of these systems for psychological treatment, these settings incur a high cost for individuals for SMI and the healthcare system. To address this issue, we will discuss underutilized and often forgotten behavior analytic interventions that have a history of effectively reducing behavioral excesses and providing skills training for individuals with SMI. We suggest that by revisiting these interventions and considering newly developed behavioral treatments, behavior analysis may be the solution to effectively treating this population.