DDI is a leading service provider for children and adults with autism and other developmental disabilities from Long Island, and provides educational, vocational, respite, and residential programs, as well as service coordination support. Today, we are the leading provider of services for children and adults with autism on Long Island, serving over 1,700 individuals and employing approximately 2,000 staff. Our mission is to help children and adults with autism and other developmental disabilities experience personal growth and fulfillment.