The mission of the Westchester ARC is to empower children and adults with developmental disabilities to achieve their potential based on personal choices, abilities and interests. The Westchester ARC has its main office in Hawthorne, NY, and there is also a location in Katonah. Founded in 1949, this organization is the largest of its kind, with more than 600 employees serving more than 1,600 individuals in Westchester County.