Guill completed postgraduate training in clinical neuropsychology at Macquarie University (Sydney) in 2003. He currently works at the John Hunter Children’s Hospital Paediatric Neuropsychology Clinic and sees children and adolescents with a wide range of medical conditions that can affect cognitive, behavioural, and emotional functioning. He has expertise in the assessment of neurodevelopmental disorders and his particular areas of interest include Attention-Deficit / Hyperactivity Disorder, Intellectual Disability, and Specific Learning Disorders. Outside these areas, he also has a special interest in Giftedness.

Guill is passionate about assisting families understand why their child is having learning and / or behavioural difficulties. The results of a neuropsychological evaluation guide treatment recommendations to provide the most individualised and comprehensive support for all who are involved in their child’s life.