In his clinical and research work he specialises in autism, aiming to find ways of improving diagnosis and treatment for people on the autism spectrum. He has also helped to design and evaluate psychological interventions to help people with autism, and published research on whether males and females on the autism spectrum show consistent differences. He is founder and co-chair of the ‘female Profile in ASD’ Special Interest Group, an international collective comprising people with autism, clinicians and scientists. The aims of this group are to improve understanding and support for females with autism.