Eleni Karatza is an Emeritus Professor in the School of Informatics at the Aristotle University of Thessaloniki, Greece. She is senior member of IEEE, ACM, SCS. Dr. Karatza’s research interests include cloud, fog and mist computing, energy efficiency, fault tolerance, resource allocation, scheduling algorithms and real-time distributed systems. She holds a PhD degree “Modelling and Simulation of Parallel Processing Systems”, and a Degree in Mathematics from the Department of Mathematics at the Aristotle University of Thessaloniki. Currently she teaches 2 postgraduate courses: Distributed Processing in Grids and Clouds, and Modelling, Simulation and Performance of Parallel and Distributed Systems. She has supervised 12 PhD theses. Dr. Karatza has authored or co-authored over 270 publications (papers in international journals, papers in international conferences and book chapters) including seven papers that earned best paper awards at international conferences. She is included in the list of the world’s top 2% of scientists (Stanford University rankings). She served as an elected member of the Board of Directors at Large of the Society for Modeling and Simulation International. She served as Chair and Keynote speaker in international conferences. Dr. Karatza is Senior Associate Editor of the Elsevier journal “Simulation Modelling Practice and Theory”, an Editorial Board member of “Future Generation Computer Systems” of Elsevier, an Associate Editor of “IEEE Transactions on Services Computing” and an Editorial Board member of “Cluster Computing” of Springer. She served as Guest Editor of multiple Special Issues in international journals.