[1] She went on to graduate with a PhD from the Faculty of Medicine at the UNSW in 1986, with a thesis titled "The organization of the ventromedial mesencephalic tegmentum".
[2] While undertaking her PhD she founded a donor program to enable study of Parkinson's disease in the brain.
[4] Halliday's research focuses on neurodegeneration, including Parkinson's disease and frontotemporal dementia.
[7] She was awarded the 2020 NHMRC Elizabeth Blackburn Investigator Grant Award for Leadership in Clinical Medicine and Science[8] and in 2021 won the international Robert A. Pritzker Prize for Leadership in Parkinson's Research.
[10] Halliday was appointed as a Companion of the Order of Australia in the 2023 King's Birthday Honours for "eminent service to medical research in the field of neurodegenerative disorders, including the development of revised diagnostic criteria for Parkinson's disease, and as a mentor".