Mental illness is a major public health problem that affects a significant portion of the population. Approximately 1 in 4 adults in the United States meets the criteria for a mental illness in a given year, while 1 in 17 experience a serious mental illness. Mental illness is associated with substantial disability and reduced quality of life. It also imposes a huge financial burden and is linked to increased rates of suicide, homelessness, and incarceration. Despite its prevalence and impacts, there remains a large unmet need for treatment and services.