Dr. Dionysis Papachristou was born in Tzouba Soudan (17.12.1971) and originated from village Voutsara (Ioannina, Greece). He received Diplοma in Electrical & Computer Engineering on 1995, and Ph.D. in Electrical Engineering on 2000, both from National Technical University of Athens (NTUA), Greece. He is working in Regulatory Authority for Energy (RAE) of Greece as Scientific Expert, since 2001. Until December of 2004 he has been coordinator in the Licensing procedure (Supply Licenses, Production Licenses for conventional and RES stations), then in the Consumer & Environment Protection Unit, and later in the Unit of Non-Interconnected Islands with lots of responsibilities in various fields of the electricity energy sector. He has been Coordinator of Competitive procedures (Auctions) Design & Implementation Unit and Coordinator of the new IT RES Platform which simplify the license procedure, increase the penetration of RES in the energy transition trajectory. Currently he is the Director of Communication Office and represent Regulatory Authority for Energy, Waste & Water (RAEWW, previous RAE) at several working groups. His research and scientific interests are in the fields of Power Systems, Circular economy, Renewable Energy Sources, energy transition Digital transformation, Energy Policy and strategy. He has published papers and studies at scientific conventions with a jury and has represented RAEWW in summits regarding the energy sector.