Yvonne qualified as a doctor in Ireland and has worked in the NHS, the private and academic sectors in the UK since 1990. She has 19 years of board level experience in public health and medicine, and 15 years of close working with local and regional government. During a secondment to the Department of Health for England she supported shaping government White Papers on health, alongside her role as a Board Director of the NHS in the South of England. In 2013 Yvonne was appointed Director for London (Public Health England) and Statutory Adviser to the Mayor of London. She subsequently led the health and inequalities components of the 2013/14 London Health Commission.
Previously as technical adviser to the World Health Organization she provided support on European Healthy Cities and has advised the World Economic Forum, the EU and the World Bank on the public health aspects of population ageing. Yvonne is a Trustee of the Royal Society for the Prevention of Accidents, a Fellow of the RSA, a Director of London Sport and holds visiting chairs in Public Health from three UK universities.