Gracie Hornsby is an environmental engineer with 8+ years of experience in the WASH sector. Gracie completed her Ph.D. focused on determinants of WASH facility use and the role of operation and maintenance at Stanford University in 2026. She has extensive experience coordinating field operations and research initiatives across South Asia, Sub-Saharan Africa, and Central America. Now, she is the Director of Partnerships at Mangrove Water, where she leads strategic efforts to scale in-line chlorination globally through peer-learning networks and technical collaborations.