Dr. Nicolson is an Associate Professor in the Department of Psychiatry and Chair of the Developmental Disabilities Program at Western University. He completed medical school at Western University before moving to The University of Toronto to do his residency in psychiatry. He worked as a visiting scientist in the Child Psychiatry Branch of the National Institute of Mental Health in the United States before returning to London.

Dr. Nicolson’s research is devoted to the understanding and treatment of children and adolescents with neurodevelopmental disorders, particularly Autism Spectrum Disorder and Intellectual Disability. He has authored or co-authored more than 120 journal articles and has presented more than 200 research abstracts at scientific conferences. As an investigator or co-investigator, he has held grants totaling over $50 million.

Dr. Nicolson's clinical practice is largely devoted to children and adolescents with Autism Spectrum Disorder and Intellectual Disability. He is a psychiatrist in the Neurodevelopmental Disorders Program at Children’s Hospital at London Health Sciences Centre and in the Autism Spectrum Disorder program at the Child and Parent Resource Institute (CPRI) in London.