Ioannis Varvaris is Deputy Research Coordinator of the ERATOSTHENES CoE and a Researcher in its Department of Environment. He holds degrees in Mineral Resources Engineering (Technical University of Crete) and Civil Engineering (Cyprus University of Technology), a Master's in Hydrogeology and Environmental Geoscience from Georg-August University, and a PhD from Aarhus University. He has held research positions in Denmark and the United States.

His expertise focuses on hydrogeological modelling, water flow and solute transport in agricultural soils, and the movement of water and energy across the groundwater–unsaturated zone–vegetation continuum. His research integrates visible-near-infrared spectroscopy, pedotransfer functions, physically based modelling, and Earth Observation services to support targeted environmental impact studies.