Elefterios Vassalos is Construction Director at Digital Realty Responsible for Greece and Italy, where he leads the delivery of mission-critical data center projects. He has overseen the construction of key facilities including ATH3, ATH4, and HER1, managing every stage from planning and engineering to execution. With extensive experience in large-scale infrastructure, Elefterios ensures high standards of quality, resilience, and operational efficiency. His expertise spans sustainable design integration, energy- and water-efficient systems, and coordination of multidisciplinary teams, contributing to Greece’s digital infrastructure growth and the delivery of future-ready, best-in-class data centers.