The largest public mental health facility in the United States is not a hospital; it is the Los Angeles County Jail. A Severely and Persistently Mentally Ill (SPMI) patient generally defines someone with a diagnosis of Schizophrenia, Bipolar Disorder, or Major Depressive Disorder, and this group constitutes about 1.7% of the US population. To better understand the condition and possible improvements, IBM Global Research and Otsuka Pharmaceuticals used an agent-based approach to model the SPMI living situations over the second half of the 20th century. Kyle Johnson, Managing Consultant with IBM Global Business Services presented this project at the 2014 AnyLogic Conference. He works within the Advanced Analytics and Optimization branch of IBM BAO.