Adj Clin Prof Gillian Nixon is an academic paediatric respiratory and sleep physician.

Her clinical practice as Deputy Director of the Melbourne Children’s Sleep Centre at Monash Children’s Hospital is centered on the management of children with respiratory and sleep disorders, specialising in non-invasive ventilation. Her research program is situated in the Department of Paediatrics, Monash University.

Adj Clin Prof Nixon's research is focussed on improvements in the diagnostic and treatment pathway for snoring and obstructive sleep apnoea in children, including developing simplified diagnostic tools and driving improvements in evidence-based treatment pathways. She has held a Translating Research into Practice fellowship from the National Health and Medical Research Council to support this research.

She has a postgraduate qualification in Health Services Management and is focussed on improving care for children through improvements in health care systems. She has built cross-disciplinary collaborations and worked with the Victorian state government 2018-2020 on related quality improvement projects regarding the management of the large number of children with snoring and obstructive sleep apnoea, a condition with significant negative effects on learning and development.