Ester Feche Guimarães is the Director of Water and Sewage Services at the São Paulo State Secretariat of Environment, Infrastructure, and Logistics (SEMIL). At SABESP, she has worked in universal service operations for vulnerable communities, holding technical, managerial, and regulatory positions. She holds a PhD in Environmental Engineering from the University of São Paulo (USP) and completed a postdoctoral fellowship at USP's Institute of Advanced Studies (IEA). She earned an MBA from Ohio University in collaboration with FGV-SP and holds an electrical engineering degree with a specialization in Sanitary Engineering from the USP School of Public Health. She is the Socio-Environmental and Cultural Director of AESABESP. She served as a Board Member of the UK Fund for Bioengineering and Nanotechnology Research for the Safewater Project for Rural Communities (NIBEC-UK). She is also a research associate for the Monitoring and Evaluation Platform of the PCJ Basin Plan in the State of São Paulo, focusing on Technological Innovation and Public Policy Programs.