Gillian graduated from Queen Margaret University in Edinburgh in 2001 with an honours degree in Dietetics. She is now working as a self-employed dietitian and has set up private dietetic clinics based in the South Dublin and Co. Wicklow areas. Gillian also has extensive experience working in large teaching hospitals both in the UK and Ireland.

Gillian is a member of the Irish Nutrition & Dietetic Institute (INDI) which is the professional organisation for clinical nutritionists/dietitians in Ireland. All professionally qualified dietitians are members of the INDI and carry the initials MINDI after their name. These initials are the only nutrition health professionals approved by health insurers. This year, Gillian joined Self Employed Dietitians Ireland (SEDI), which is a working group of entrepreneurial freelance consultant dietitians in Ireland.