Fiona has a background in local government and the NHS. Graduating with a degree in politics and economics in 2001, and with a Masters in Community Development in 2003, she spent two years working as a community engagement manager for Fingal County Council in her native Ireland. Moving to London in 2005 she joined the North East London Strategic Health Authority's Regeneration Department working on a pilot scheme aimed at moving people on long-term incapacity benefits onto NHS career paths.
In 2006 she joined Neil Stewart Associates where she led the health and social care division. She organised public policy conferences for organisations such as the National Association of Primary Care, the Royal College of Midwives, NHS London and Counsel and Care. Before joining the Fund she worked at the Royal Society of Arts on the 2020 Public Sector Reform Summit. She joined The King's Fund as Head of Events in October 2010.