Gill has worked in the NHS for over 30 years in a variety of roles; Community Child Health doctor, GP and Lecturer in Primary Care, then Consultant in Public Health Medicine, becoming Director in Public Health for Caerphilly Local Health Board then Gwent/ Aneurin Bevan University Health Board from 2003-17. She has sat on Gwent LRF, four Public Service Boards, Gwent Health and Social Care Regional Planning Board and was Chair of Gwent Area Planning Board for Substance Misuse. She has published on waterborne infectious disease outbreaks, blood borne viruses, cardiovascular health and inequity, cancer inequities, climate change, refugee and asylum seeker health, and health literacy for all. She is passionate about tackling health inequity and promoting mental health resilience and ACE/Trauma-informed approaches as a precursor for universal health improvement. She has sat on Gold command for the Celtic Manor NATO summit, overseen a major 4 nation UK blood-borne virus Look back and sits on several 5 Nation groups for NHS International Health and for Health Improvement. She is Assistant Director of Policy and International Health, WHO Collaborating Centre on Investment for Health & Well-being (WHO CC), Public Health Wales. She has previous international health experience in North and West Africa, India and Hong Kong. She is PHW lead for Wales for Africa and represents NHS Wales on the National Refugee and Asylum seekers and Homelessness Task forces. She is also a member of the Faculty of PH UK Ethics Committee, She is Chair of Strategic Priority 2 (Mental Health & Resilience) and Substance Miscue Board, PHW. She is the Joint Action for Health Equity Europe Wales/UK Lead for Migrant Health.