Geraint Lewis is currently working on sabbatical in Chicago as Senior Director, Outcomes and Analytics, at Walgreens.

Geraint trained in medicine at Cambridge University and worked in acute medicine and emergency medicine in the UK and Australia before specialising in public health, with a particular interest in international health policy, predictive modelling and case management.

Working at Croydon Primary Care Trust between 2004 and 2006 he developed and implemented the Virtual Wards project. The scheme won an unprecedented four prizes at the Health Service Journal Awards in November 2006 and was the overall winner of The Guardian Public Services Awards, 2007.

After leaving Croydon, Geraint became a Policy Advisor at the Cabinet Office and Visiting Fellow at The King's Fund. He is the author of the postgraduate text book: Mastering public health (Royal Society of Medicine Press, 2008), as well a number of peer-reviewed articles in leading journals such as the Milbank Quarterly, the British Medical Journal and Health Services Research.

Geraint was a 2008-09 Commonwealth Fund Harkness Fellow in Health Care Policy and Practice in New York; was the 2008 recipient of the National Directors' Award at the Department of Veterans Affairs in Washington, DC; and in 2011 he was awarded Bradshaw Lectureship of the Royal College of Physicians of London.