Kumanan Rasanathan, M.B.Ch.B., M.P.H., is a public health physician with 20 years’ experience in health and related sectors, and currently works as Coordinator, Health Systems, at the World Health Organization in Cambodia, where he leads a team working on health systems and services, antimicrobial resistance and maternal and child health, with the Royal Government of Cambodia. He was previously Chief, Implementation Research Unit and Delivery Science Unit and Senior Adviser Health for UNICEF in New York, working on implementation research focused on improving child service delivery, universal health coverage, district health system strengthening, health systems resilience post-Ebola, integrated community case management, the Sustainable Development Goals agenda, and multisectoral approaches to child health. Prior to this, Dr. Rasanathan worked for WHO in Geneva on primary health care and the social determinants of health, and in a number of different countries as a clinician, researcher, policy maker, program manager, and advocate. He started his public health career running Phase I and II vaccine clinical trials leading to the licensure and rollout of meningococcal B vaccine in New Zealand.