Westchester ARC is the oldest and largest agency in Westchester County serving adults and children with developmental disabilities and their families. Founded in 1949 by a group of parents of children with mental regardation, Westchester ARC has grown to an organzation of over 600 employees who serve more than 1,600 people in the county. Early intervention, teen youth groups, and living skills classes for adults are just a few of the services offered.