As the Senior Science Lead for Cities, Urbanization and Health for the Wellcome Trust’s Our Planet Our Health Programme, Dr. José Siri helps manage the programme’s portfolio of urban research and build strategic engagement to advance the field of planetary health. Dr. Siri has worked to develop and apply systems approaches to urban health, focusing on leveraging science for healthy development, developing simple systems tools to catalyze better decision-making, and improving understanding of complex challenges. He was a co-founder of the Urban Health Research Network for Latin America and the Caribbean (LAC-Urban Health) and a commissioner on the Tsinghua-Lancet Commission for Healthy Cities in China and continues to advise the Future Earth Urban and Health Knowledge-Action-Networks (KANs). Previously a research fellow at the UN University International Institute for Global Health, he led an urban health research and policy focus, contributing to the 2030 Sustainable Development Agenda and at meetings like the 9th World Urban Forum and Habitat III. Dr. Siri was previously a researcher at the International Institute for Applied Systems Analysis (IIASA), an associate editor for the PAHO Journal, and a consultant for the International Council for Science (ICSU), helping to plan and develop their global interdisciplinary programme on Systems Science for Urban Health. He received his Ph.D. in Epidemiological Science and a Master of Public Health from the University of Michigan, and a B.S. in Biology from Cornell University.