Professor Neil Hewitt is the Director of the Centre for Sustainable Technologies at the University of Ulster. CST is an inter-disciplinary research centre challenging many aspects of sustainability associated with the built environment. Typically consisting of over 30 academics and researchers, it seeks to undertake ground-breaking activities in such areas as energy storage, solar energy, biomass and bioenergy and heat pumps. Professor Hewitt represents the UK in Commission B2 (Refrigerating Components) of the International Institute of Refrigeration and has participated in and led numerous European, national and local programmes on heat pumps. His research focuses on the role of heat pumps in building retrofit, demand side management and energy storage.