Nikos D. Chatziargyriou is Chairman and CEO of the Hellenic Electricity Distribution Network Operator (HEDNO S.A.). Since 1984 he is with the Power Division of the Electrical and Computer Engineering Department of the National Technical University of Athens and since 1995 he is full professor in Power Systems. From February 2007 to September 2012, he was Deputy CEO of the Public Power Corporation (PPC) of Greece, responsible for Transmission and Distribution Networks, island DNO and the Center of Testing, Research and Prototyping. He was Chair of PPC Telecommunications and Vice-Chair of PPC Renewables. He is Fellow Member of IEEE, past Chair of the Power System Dynamic Performance Committee, Distinguished member of CIGRE and past Chair of CIGRE SC C6 “Distribution Systems and Distributed Generation”. He is Vice- Chair of the EU Technology and Innovation Platform on SmartGrids. He is member of the Energy Committee of the Athens Academy of Science. He has participated in more than 60 R&DD Projects funded by the EC and the industry, and has coordinated among others the EU “Microgrids” and “More Microgrids” projects. He is author of the book “Microgrids: Architectures and Control” and of more than 180 journal publications and 500 conference proceedings papers.