Osman A Dar is a fellow of the Royal College of Physicians Edinburgh (FRCP Edin) and a fellow of the Faculty of Public Health (FFPH London). At Chatham House, he is director of the Centre on Global Health Security's One Planet-One Health project, an umbrella term referring to the Centre's work on zoonotic emerging infections, ecological approaches to disease control, antimicrobial resistance, sustainable livestock development and food security. Osman is also a consultant in global public health at Public Health England where he takes technical lead on capacity building projects that support health system strengthening in low and middle income countries.