Dr Fellowes is the Lead Scientist for Molecular Diagnostic development. He began his career in diagnostic genetics in the Molecular Pathology Section at Canterbury Health Laboratories in 1989 and headed the section from 2002 until 2011, when he joined the Pathology Dept of the Peter MacCallum Cancer Centre. He completed a PhD at Otago University, is a fellow of the Human Genetics Society of Australia and a founding fellow of the Faculty of Science of the RCPA.

He sits on a number of national and international committees including the Diagnostic Advisory Group of the Melbourne Genomics Health Alliance, the Australian Genomics Health Alliance Diagnostic Steering Committee, the RCPAQAP Molecular Genetics Advisory Committee, and the International Affairs Committee of AMP. Dr Fellowes focuses on implementing personalised medicine by translating genomic technologies and laboratory automation to the diagnostic labs.