His group is primarily involved in researching the genetic basis of mitochondrial energy generation disorders. They were among the first to use Next Generation Sequencing technologies to identify mutations in known and novel disease genes. This subsequently expanded into multi-omic approaches incorporating transcriptomics and proteomics to identify candidate genes and provide functional validation of genomic variants. His team has identified pathogenic mutations in >600 patients in >100 genes, including 13 mitochondrial DNA genes and 30 novel nuclear disease genes. As co-lead of the Australian Genomics Mitochondrial Flagship (2017-20) and Lead of the Medical Research Future Fund-supported MitoMDT project (2021-25), he has developed national networks seeking to incorporate genomic and multi-omic testing into Australian healthcare. He is a member of the executive of RDNow, whose vision is to enable all children seen on the Royal Children’s Hospital campus with a rare disease to receive an accurate diagnosis, care, and available therapy within one year of coming to medical attention. As a Director of the Mito Foundation, he was the academic/research Lead for the Foundation’s campaign to legalise mitochondrial donation, culminating in Maeve’s law being legislated in 2022.