Elsa Fan is a medical anthropologist who studies how global health knowledge and practices travel across social and cultural contexts. Her book Commodities of Care: The Business of HIV Testing in China (University of Minnesota Press, 2021) examines how HIV testing unfolded in unexpected ways for men who have sex with men in China. She has written about performance-based financing, metrics, and evidence-based global public health. She is currently an Associate Professor of Anthropology at Webster University, Missouri.