Dr Mitchell completed his medical training at the University of Queensland, and undertook paediatric training at Sydney Children’s Hospital. He specialised in paediatric haematology/oncology, which included two clinical fellowships in paediatric bone marrow transplantation at the University of Minnesota, MN USA, and Memorial Sloan Kettering Cancer Centre, NY USA. Dr Mitchell is currently employed as a Paediatric Haematologist/Oncologist at the Kids Cancer Centre, Sydney Children’s Hospital. He is Deputy Director of the Blood and Marrow Transplantation Program at the Kids Cancer Centre, and a Conjoint Lecturer at the University of New South Wales. Dr Mitchell is the current chair of the ANZCHOG Bone Marrow Transplantation subgroup, the Australasian representative on the Children’s Oncology Group Cellular Therapy Steering Committee, and a member of the Australian Children’s Cancer Trials board. Dr Mitchell’s research interests include high risk leukaemia and non malignant transplantation, and he currently leads a national trial in the use of TCR α⁺β⁺/CD19⁺ cell depletion in paediatric patients undergoing bone marrow transplantation.