Developmental Disabilities Institute

Home
United States
Smithtown, NY
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.

12/21/2025

Participants from one of our residences showed a little holiday cheer and a lot of creativity—gingerbread house making at its finest!

12/19/2025

Navigating the Holidays with Joy & Ease! 🎄

The holiday season is wonderful, but it often brings extra stress and changes to routines. This year, DDI is here to help! Tune in to the special new episode of the [EYE] on Autism Podcast: "DDI's Holiday Tips."

Listen & Watch Now: https://bit.ly/44D8c0j

12/18/2025

From preschool through adulthood, supports every step toward independence and inclusion. Your generosity helps fuel the care, education, and opportunities that make it all possible.

Together, we make great things possible.💙

Donate Now ➡️ https://bit.ly/4oPTBWD

12/16/2025

🎙️Episode 4 of the [EYE] on Autism Podcast -- brought to you by DDI has dropped.

Our special "Holiday Tips" episode featuring DDI’s Director of Behavioral Health Services, Dr. Dana Reinecke, is now live on:

✔️Spotify - https://bit.ly/4rX1GeK
✔️YouTube - https://bit.ly/48Gw19X
✔️Apple Podcasts - https://apple.co/4aSysaS
✔️Our website - https://bit.ly/483U6az

👉Listen now and be sure to join in on the conversation.

12/14/2025

From all of us at DDI, we wish you a bright and meaningful Hanukkah! 🕎💙

12/12/2025

Check out this quick recap of our 2025 Walk at the Suffolk Credit Union Arena. Held on 11/22, this incredible day brought our DDI family together in the best way. Thank you to everyone who showed up, supported and helped make this event such a meaningful success.

12/11/2025

Every journey at DDI begins with possibility. From preschool through adulthood, DDI supports children and adults with autism and other developmental disabilities every step of the way, and it’s your generosity that helps makes that care possible.

Please take a moment to read this special message from our CEO and Board Chairperson: https://bit.ly/3Yk9BoT

Click here 👉 https://bit.ly/4oPTBWD to be part of what's possible.

12/10/2025

On Human Rights Day, we reaffirm DDI's commitment to honoring the dignity, rights, and choices of each person we support. Access to everyday essentials—respect, inclusion, opportunity, and safety—is a right, not a privilege. We work every day to ensure that the people in our care have what they need to realize their full potential.

12/09/2025

We're collecting lapghans and small blankets for the residents of the Long Island State Veterans Home at Stony Brook University—and we'd love your support! Whether handcrafted with care or generously store-bought, every blanket brings warmth and comfort to those who have served our country.

📅Collection runs through January 30th
📍 Deliver to 99 Hollywood Drive, Smithtown, NY 11789

Thank you for helping us honor our veterans in such a meaningful way.

For more info, contact Joyce at joyce.sullivan@ddiny.org or Tracey at tracey.ryan@ddiny.org.

12/08/2025

Have you seen the news? DDI is in Newsday!

Click here 👉 https://nwsdy.li/3XI9rYb to read more about the Power of Possibility and to see how we're supporting children and adults with autism and other developmental disabilities. 💙

12/07/2025

Talented students and an alum from the Children's Day Program have been hard at work creating beautiful to sell within the building.

They do it all—from designing and printing to preparing, packaging AND selling each one.

This project gives them meaningful, transferable skills, including customer service, practicing sales techniques and handling payments. We're so proud of all they have accomplished and the care they put into every card.

Address

99 Hollywood Drive
Smithtown, NY
11787

Website

http://ddiny.org/

Alerts

Be the first to know and let us send you an email when Developmental Disabilities Institute posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Practice

Send a message to Developmental Disabilities Institute:

Shortcuts

Want your practice to be the top-listed Clinic in Smithtown?

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.”