Žarko Vranjanac, Ph.D., is a research associate at the Innovation Center of the University of Nis (Serbia), specializing in environmental protection engineering. He earned his doctorate in 2024 at the Faculty of Occupational Safety in Nis, focusing on evaluating the environmental performance in public utilities. His research covers environmental indicators, water supply, wastewater management, waste management, the circular economy, and sustainable urban development. Dr. Vranjanac has expertise in data analysis, performance modeling, and multi-criteria decision making. His scientific contributions are indexed in WoS and Scopus, with publications in high-impact journals such as Environmental Science and Pollution Research, the Journal of Environmental Protection and Ecology, and Fressenius Environmental Bulletin. He has presented at international conferences and published in journals. Previously, he worked at the Mathematical Institute of SANU and the Faculty of Occupational Safety. His interdisciplinary work advances sustainability through innovative research and performance-based assessment methods, contributing to improved environmental management and municipal infrastructure efficiency.