Nikos Mellios is a Postdoctoral Researcher in the Civil Engineering department, University of Thessaly, Greece. Since 2020 he holds a PhD on “Environmental Informatics and Ecological Modeling for Sustainable Water Systems” under the supervision of Prof. Chrysi Laspidou. He accomplished his MSc on “Analysis and Simulation of Hydraulic and Water Resource Systems” in 2013, while in 2010 he obtained his Environmental Engineering Integrated Masters Degree from the Technical University of Crete (TUC). His research interests and expertise are focused on Mathematical Modelling, Water-Energy-Food-Land Use-Climate NEXUS, Water Resources Modelling & Management, Environmental Informatics, Bayesian Hierarchical Modeling & Machine Learning Methods in Predicting Toxicity in Freshwater Ecosystems, and IoT technologies for Smart Water Systems. He has an extensive research experience by participating as an Assistant Researcher in several national and EU-funded projects, such as LAKEREMAKE, ISS-EWATUS, ALLIANCE, SIM4NEXUS, NANOSWS, WATER4CITIES, LOTUS, MAGO, SMARTEN, NEXOGENESIS, and ARSINOE. He has worked as an Environmental Engineer in the water utility of Skiathos, while he has also gained experience as a Marie-Curie Fellow in the Jožef Stefan Scientific Research Institute, in Slovenia. He has been teaching at the Civil Engineering Department, University of Thessaly and at the Νon-Commissioned Officers’ School. He is a Working Group co-leader of the NEXUSNET Cost Action CA20138. In 2020, he was chosen as a trainer in Water Academies, organised by the European Institute of Innovation & Technology (EIT), to present “Water Scarcity in Industry”. His scientific work has been published in reputable scientific journals, such as Ecological Engineering and Water Research.