Dr Hassall is the Clinical Lead of the CHQ HHS Neuro-Oncology and Retinoblastoma Services at CHQ HHS. He is also the Clinical Leader of the Centre for Child and Adolescent Brain Cancer Research Centre based at Centre for Children’s Health Research which is a collaborative group of IMB UQ, Diamantina Institute UQ, IHBI QUT and QIMR Berghofer. He is a past National Treasurer of the Australian and New Zealand Children’s Haematology and Oncology Group and the past Chair of the CHQ Medical Staff Association. He is a member of the ANZCHOG CNS subcommittee.