Developmental Disabilities Institute

Developmental Disabilities Institute We help children and adults with autism and other developmental disabilities experience personal growth and fulfillment.

For more than 60 years, Developmental Disabilities Institute (DDI) has provided compassionate personal care to meet the emotional, educational, therapeutic, and vocational needs of children and adults with autism and other developmental disabilities. Founded by parents of children with developmental disabilities, DDI has grown into a dynamic, nonprofit, multi-site agency serving more than 1600 children and adults in our care each day. The parental influence continues with several of our board members being mothers and fathers of the people we serve. DDI recognizes that each person in our care has unique needs and deserves every opportunity to live a rich and meaningful life. Over six decades, we have built a strong reputation for providing exceptional services for all people in our programs, and in particular those who present with the most significant challenges. With a workforce made up of people inspired by purpose®, DDI provides the highest standards of individualized services from expertly trained, caring, and competent staff. For more information, visit www.ddiny.org.

Students at the Children's Day Program in Huntington recently celebrated the Lunar New Year. As part of their Art curric...
02/27/2026

Students at the Children's Day Program in Huntington recently celebrated the Lunar New Year. As part of their Art curriculum, students worked together to construct and decorate a traditional ceremonial dragon. They painted scales and assembled the dragon’s body from individual sections. The festivities concluded with a parade where students proudly walked the dragon, and showcased their handmade paper fans and lanterns—all accompanied by the playing of bells and drums.

On this , DDI would like to highlight the generosity of the Enterprise Mobility Foundation for selecting us as one of i...
02/24/2026

On this , DDI would like to highlight the generosity of the Enterprise Mobility Foundation for selecting us as one of its grant recipients. It is an honor to receive such meaningful support that will strengthen the communities we serve. A special thank you to Enterprise Mobility team member, Felicia Goodman, for submitting for this grant and for her continued support in advancing our mission. We are very grateful and hope that, together, we will continue to make a difference in the lives of the people in our care.

Students in the Smithtown Children's Day Program had a wonderful time celebrating the 2026 Winter Olympics. From the Lug...
02/24/2026

Students in the Smithtown Children's Day Program had a wonderful time celebrating the 2026 Winter Olympics. From the Luge to Hockey, they got to experience friendly competition, play different sports, and be part of !

❄️DDI schools and adult day programs will be closed tomorrow—Tuesday, 2/24/26—due to the weather. Administrative offices...
02/23/2026

❄️DDI schools and adult day programs will be closed tomorrow—Tuesday, 2/24/26—due to the weather. Administrative offices are operating remotely.

Please stay tuned for updates as they become available.

❄️DDI schools and adult day programs will be closed tomorrow—Monday, 2/23/26—due to the weather. Administrative offices ...
02/22/2026

❄️DDI schools and adult day programs will be closed tomorrow—Monday, 2/23/26—due to the weather. Administrative offices are operating remotely.

Please stay tuned for updates as they become available.

We have exactly two weeks till our 4th annual co****le tournament. Whether you’ve been practicing your arc in the backya...
02/21/2026

We have exactly two weeks till our 4th annual co****le tournament. Whether you’ve been practicing your arc in the backyard or you’re just in it for the glory and the atmosphere, the time has come to see who will be crowned the 2026 Boss of the Toss.

Why you can't miss this:

✔️The Ultimate Title: There are many co****le winners, but only one 65th Anniversary Boss of the Toss. Your name could be on that trophy forever.
✔️The Atmosphere: We’re bringing the DDI family together at Pickleball Heaven in Medford for an afternoon of family, food, and fun.
✔️The Mission: Every single toss supports DDI’s vital programs for children and adults with autism and developmental disabilities. You’re playing for a win, but you're tossing for a cause.

Join us: https://bit.ly/4sQPCfz

Employee Involvement Committee—Valentine's Day Movie Night! ❤️Last week, lots of love and laughter went into this close-...
02/19/2026

Employee Involvement Committee—Valentine's Day Movie Night! ❤️

Last week, lots of love and laughter went into this close-knit gathering of DDI staff! They came together to watch the movie Valentine’s Day, starring Julia Roberts, Bradley Cooper, Anne Hathaway, and many more! Congratulations to Joyce Sullivan, Lisette Juarabe, and Tara Alibrandi for winning big on the raffle prizes! Thank you to those who helped set up and to those who came and enjoyed!

Teams, Get Ready—Co****le is Almost Here! Toss Like a Boss for 65 Years of Impact. On Saturday, March 7th, from 1:00 PM ...
02/18/2026

Teams, Get Ready—Co****le is Almost Here! Toss Like a Boss for 65 Years of Impact. On Saturday, March 7th, from 1:00 PM to 5:00 PM at Pickleball Heaven in Medford, the DDI family will come together for an afternoon of competition, community, and celebration. Visit ➡️ https://bit.ly/4sQPCfz to get your tickets, sponsor, or donate today.

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SAVE THE DATE!Mark your calendars and be ready to hit the green on June 8th. We are returning to DDI’s favorite course a...
02/17/2026

SAVE THE DATE!

Mark your calendars and be ready to hit the green on June 8th. We are returning to DDI’s favorite course at Muttontown in East Norwich!

🗓️ Monday, June 8th
📍The Muttontown Club, 5933 Northern Blvd, East Norwich

Today, we offer a warm salute to our nation's leaders—Happy Presidents Day!
02/16/2026

Today, we offer a warm salute to our nation's leaders—Happy Presidents Day!

On 2/12/26, the 100th day of school was celebrated at the Early Childhood programs. Staff and students got into the spir...
02/15/2026

On 2/12/26, the 100th day of school was celebrated at the Early Childhood programs. Staff and students got into the spirit by wearing crowns, filling in 100 gumballs with dot markers, taking 100 steps from their classroom, and imagining what they would look like at the age of 100. They also took part in a variety of counting activities throughout the day to celebrate this special event!

Happy Valentine’s Day to our amazing ! May your day be overflowing with love, joy, and all the warm moments that make y...
02/14/2026

Happy Valentine’s Day to our amazing ! May your day be overflowing with love, joy, and all the warm moments that make your heart smile.❤️🌹

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99 Hollywood Drive
Smithtown, NY
11787

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Our Story

Developmental Disabilities Institute (DDI) was founded in 1961, to address the special needs of children with Autism and other developmental disabilities, and provide therapeutic intervention. Today, DDI is a non-profit, multi-site agency serving over 1,500 children and adults with autism and related disorders, providing educational, residential, day habilitation and vocational services across Long Island, NY. DDI’s educational, residential day habilitation and vocational offerings are as diverse as the people we serve. Due to this, we have grown to include 5 main campuses located in Smithtown, Huntington, Medford, Riverhead and Ronkonkoma, NY, as well as 30 residential and day habilitation sites.

Through almost 60 years of sustained effort, DDI has become widely known in our area. Today, we are the largest provider of services and programs for children and adults with autism on Long Island. The goal of our agency is to recognize the needs of each individual while maintaining the highest standards of teaching and training for our children, their families, and our staff. DDI prides itself on being in the forefront of the most effective methods in use today for the treatment of autism and related disorders.

Our Purpose: “We help children and adults with autism and other developmental disabilities experience personal growth and fulfillment.”