Professor David Gallagher is a Consultant Medical Oncologist and Consultant Medical Geneticist. He graduated from University College Dublin Medical School, and trained on the Irish specialist registrar scheme in medical oncology.  He was awarded the first ISMO Fellowship to MSKCC in 2006, and uniquely completed training in both Medical Oncology and Medical Genetics between Memorial Sloan Kettering Cancer Centre, and New York Presbyterian Cornell University Hospital. 

Professor Gallagher worked in Memorial Sloan Kettering Cancer Centre for four years before returning to Ireland in 2010 where he established a Medical Oncology and Medical Genetics practice at the Mater Private Hospital. He is the National Clinical Lead in Cancer Genetics with the National Cancer Control Programme and a Clinical Professor of Medicine at Trinity College Dublin.