DDI is a not-for-profit organization dedicated to providing educational, residential,
day habilitation and vocational, as well as medical, dental and other health-related services to over
5,000 children and adults with autism and other developmental disabilities.
From humble beginnings a half-century ago, DDI through its many sites across Suffolk and Nassau
Counties has become the largest provider of services for people with autism on Long
We were founded in 1961 by a small group of parents, determined to find a better way to address
the special education and therapeutic needs of their children. They came together to form
The Suffolk Center for Emotionally Disturbed Children, hiring teachers and staff and offering classes
in their own basements. Over time the program evolved and enrollment grew.
Five decades later DDI has emerged as a leader in our field, committed to treatments and programs that
are supported and refined by evidence-based research in our field. Reaserch Link
Fifty years later we remain fully dedicated to the mission that our founders
created, “to support children and adults with developmental
disabilities in achieving a lifetime of growth through exceptional care and
innovative, individualized service.” Clearly this mission will be ours for the next
fifty years, and beyond.