Gemma trained as a molecular geneticist (PhD) and Genetic Counselor (CGC ABGC). At the Stanford spinout Personalis, she developed a clinical genomic sequencing test to diagnose rare conditions. Gemma directed molecular genetics courses for genetic counseling students at Stanford and California State Universities. She is the Chair of the British Society for Genetic Medicine and the Cambridge Rare Disease Network. As Course Director for the Genomic Medicine Masters programme at the University of Cambridge and Education & Training Lead for NHS East Genomics, Gemma works passionately to facilitate the mainstreaming of genomics within the NHS.