top of page


Angelman Syndrome (AS) is a neurogenetic disorder of Chromosome 15 that results in intellectual and developmental delay. It affects about 1 in 15,000 people of all ethnicities;  males and females equally.


The condition is named after Dr Harry Angelman who was the first person to make an observational diagnosis of 3 children who displayed very similar characteristics. His medical paper was published in 1965.


  • Individuals with Angelman Syndrome are non-speakers or may speak only a few words, however their receptive language is typically more advanced than their expressive language. With the recent advances in technology, those who have access to speech devices and AAC support, are learning to communicate better.

  • Mobility and balance impairments are common, and in more severe cases, some require the use of a wheelchair.

  • Most suffer with seizures and all require life-long 24/7 care.

  • Most people with AS thrive in an inclusive learning environment with appropriate supports. Always presume competence.


More medical information on Angelman syndrome, HERE.

People who have Angelman Syndrome are all unique individuals. Best known for their wonderful smiles & warm personalities, they have the same basic wants, needs, hopes and dreams as anyone else – a need to feel loved, valued and included. An exceptional gift that they usually offer, is affection, joy and unconditional love.

International Angelman Day (IAD) is supported by over 50 Angelman organisations and interest groups from around the world. Their websites share detailed information about AS, in all languages. Please join us from wherever you are, to commemorate this special day and help us achieve our objectives together.

Together we have a stronger voice.

A smiling young man wearing a striped T-shirt
A family photo with adults and children
A communication page showing 20 symbols used for shopping
A young girl sitting at a desk using a roller and painting on paper.
bottom of page