Nathan’s research focuses on advancing our understanding of environmental health risks and the design of potable reuse and drinking water treatment systems in challenging environments, towards improving public health outcomes and the resilience of our water systems to stressors such as climate change. He accomplishes this through a range of interdisciplinary research methods, and through partnerships with governments, engineers, water utilities, water system operators, and community organizations across Latin America and the Caribbean, Africa, Asia, North America, and Europe. For the 100 Million Initiative, he is working to improve the fit-for-purpose design of water supply systems and to improve the capacity of water system operators and managers to respond to public health risks, with a focus on schools and healthcare facilities.