Christian Lienhardt, MD, DTM, MSc, PhD, is Director of Research at the French Institute for Research on Sustainable Development (IRD), in Montpellier, France, where he is in charge of a research portfolio on tuberculosis and co-morbidities. He is an Infectious and Tropical Disease specialist and Clinical Epidemiologist, graduated from the Universities of Strasbourg (France), and London (UK). He worked several years as a clinician in France, and undertook medical relief and health development work with various NGOs in several countries in the Middle-East and in Africa (1981-1989). He started his research work on leprosy at the London School of Hygiene and Tropical Medicine (UK) and then in Bamako (Mali) (1990-1994). He then carried out clinical and epidemiological research on tuberculosis in The Gambia with the UK Medical Research Council (MRC) and then in Senegal with the French Institute for Research on Sustainable Development (IRD) (1994-2004). His research work included observational cohort and case-contact studies, international multicenter randomized controlled trials, and programmatic and operational research studies He headed the Clinical Trial Division at the International Union Against Tuberculosis and Lung Diseases (The Union) in Paris from 2004 to 2008. He joined the World Health Organisation, Geneva (Switzerland) from 2009 till 2018, first as Senior Research Advisor at the Stop TB Partnership, in charge of the TB Research Movement, and then as Team Leader, Research for TB Elimination, at the Global TB Programme, in charge of support and promotion of TB research in high- and medium TB burden countries, as well as of the evaluation and introduction of new TB drugs and regimens.