Johnson is a chiropractor with a special interest in paediatrics. He spent many years working with babies and teenagers, seeing children with neuro-musculoskeletal conditions (e.g. cerebral palsy) and with stroke.
Keen to provide a great level of evidence-based care for his patients, Johnson investigated neurodevelopmental functional neurology and trained in The Mellilo MethodTM.
In 2023, he became the 8th Australian to be awarded the Fellowship of IBFN in Childhood Neurodevelopmental Disorders (FIBFN-CND).