Catherine Machalaba is the Principal Scientist for Health and Policy at the conservation and global health organization EcoHealth Alliance. She was a lead author of the World Bank Operational Framework for Strengthening Human, Animal and Environmental Public Health Systems at their Interface (“One Health Operational Framework”) published in 2018 to assist countries and donor institutions in implementing One Health approaches. She is a member of the One Health High-Level Expert Panel (OHHLEP), an expert group formed in 2021 to advise the Food and Agriculture Organization of the United Nations, the World Health Organization, the World Organisation for Animal Health, and the United Nations Environment Programme. She is also a member of the WHO-IUCN Expert Working Group on Biodiversity, Climate, One Health and Nature-based Solutions. Catherine has held several leadership roles in the American Public Health Association and served as programme officer for the IUCN Species Survival Commission Wildlife Health Specialist Group for ten years. She works on several projects focused on biodiversity and protected areas, disease risk reduction, and improving preparedness for climate-sensitive and other environmentally-linked diseases, including Rift Valley fever. She holds a masters in public health and a PhD in environmental and planetary health sciences.