Subhash is a professor of health economics and the Head of Department of Health Sciences and the Lead of the Health Economics Research Group (HERG). Subhash's research has contributed to several public health policies. The suite of NICE Public Health ROI Tools – which provided the basis for many public health investment decisions in England - was informed by the work on tobacco control led by Subhash. The ROI tools are practical, customisable models to help make real-world decisions in context of local government decision-making. Subhash led the roll out of ROI work to several European nations through a €2 million multi-centre European Commission funded study, EQUIPT. He has been the coordinator of a large-scale interdisciplinary collaboration of national and international expertise. Subhash is the lead author of a book, ROI in Public Health Policy: Supporting Decision Making (Palgrave Macmillan).