Mission Statement: Cornerstone Montgomery empowers people living with mental health and co-occurring substance use disorders to live, work, and integrate successfully within the community. Cornerstone Montgomery is an independent, nonprofit organization that has a capacity to serve 2,400 adults who are living with severe mental health disorders and co-occurring substance use disorders. Cornerstone Montgomery is the outcome of the July 1, 2013 merger between two stalwart nonprofit mental health providers in Montgomery County, Maryland