Health economist with over thirty years of experience in economic analysis and research in low and middle income countries, with a focus on collaborations that enhance capacity; and inform policy.

Substantial experience in evidence based health sector planning and priority setting, with an emphasis on the generation of health economic evidence for use in policy. Extensive experience supporting national health planning and priority setting, aid effectiveness, and cost-effectiveness analysis in a wide range of countries. Directed and provided economic support to European Community and World Bank funded health sector reform and development projects in Yemen, East Timor, Syria and Sudan: supporting the development of health benefit packages, national strategic plans and medium term expendture frameworks.

Led a wide range of influential economic research on priority setting, costing, poverty and economic impact, financing and economic evaluation. Research topics include HIV prevention for key populations (Avahan programme), the integration and organisation of HIV care and treatment services (Integra project), and new diagnostics for TB (Xpert MTB/RIF) and the prevention of violence against women and girls (What Works). Interested in methods to incorporate health systems and other constraints and a societal/equity focussed perspective into economic evaluation and priority setting. Module organiser for LSHTM's distance learning course in economic evaluation.

Currently Executive Director at the Amsterdam Institute for Global Health and Development and previous Director of LSHTMs Centre for Health Economics in London and co-Director of LSHTM's Global Health Economics Centre. Member of WHO's the Strategic and Technical Advisory Group for TB in SEARO region (STAG- TB SEORO), and for Infections Hazards (STAG-IH). Previously sat on the WHO's Global TB Programme (STAG-TB) and Task Force on Catastrophic Cost Measurement for TB, and on the Lancet Commission for TB; and many Guideline Development Groups. Founding member of the TB-MAC modelling consortium. Lead investigator of the Global Health Costing Consortium; a Bill and Melinda Gates funded project to estimate and analyse HIV, TB and other health service costs globally. Currently supporting several countries develop health benefit packages as part of the Disease Control Priorities (DCP) project and International Decision Support initiative (IDSI). co-Lead investigator of the Exemplars in Primary Health Care project funded by Gates Ventures. Awarded the Joep Lange Chair at the Amsterdam Institute for Global Health, University of Amsterdam in 2018.