Founded in 1950 by a group of parents and other concerned individuals, The Arc of the United States is the nations oldest and largest advocacy and service organization by and for children and adults with intellectual and developmental disabilities. The Arc of the United States is comprised of more than 850 chapters and boasts more than 140,000 members. Ranked by Forbes Magazine as one of the nations largest charities, the Arcs annual convention attracts more than 600 attendees who look to our exhibitors to provide them with information on products and services, as well as awareness materials to support them in their roles as parents, siblings, children, self-advocates, volunteers, and professional staffers.