Professor Siân Griffiths OBE is Chair of the Global Health Committee and Associate Non-Executive member of the Board of Public Health England and Trustee of the Royal Society of Public Health .Siân practiced as a service-based public health physician at local, regional and national level in the UK and was President of the UK Faculty of Public Health of the Royal College of Physicians as well as the first Co-Chair of the UK Public Health Association.

In 2003 Siân chaired the Hong Kong SAR government's SARS Inquiry joining the Chinese University of Hong Kong (CUHK) as Director of the Jockey Club School of Public Health and Primary Care in 2005. Her tenure at CUHK saw the development of multidisciplinary approaches to public health education and extensive networks across China, Asia and beyond. Now Emeritus Professor as well as Senior Adviser on International Academic Development for CUHK she is Visiting Professor at IGHI, Imperial College, Honorary Senior Visiting Research Fellow at Oxford University as well as being involved in community based projects in the UK.