Orestis Telelis is Assistant Professor in the Department of Digital Systems, of the University of Piraeus. He obtained his degree from the Department of Informatics and Telecommunications of the National and Kapodistrian University of Athens, in 2001. He received his M.Sc. Diploma in Advanced Information Systems (2003) and his Ph.D. in Theoretical Computer Science (2006), from the same department. He worked as a post-doctoral researcher in the Evry-Val d’Essonne University (France, 2007) and in Aarhus University (Denmark, 2007-2009). During the period 2009-2010 he received the “Allain Bensoussan” fellowship from the European Research Consortium for Informatics and Mathematics (ERCIM), for post-doctoral research at the Center for Mathematics and Computer Science (CWI Amsterdam) of the Netherlands. Subsequently, he worked as Research Associate in the Department of Computer Science of the University of Liverpool (United Kingdom, 2010-2012). In the period 2012-2014, he received funding from the General Secretariat of Research and Technology (Greece), for scientific research at the Athens University of Economics and Business. His research interests lie broadly within the fields of Algorithms Design and Analysis and of Computational Complexity. His recent work is on Algorithmic Game Theory (Mechanism Design, Computation and Efficiency of Equilibria, Auctions and Pricing Algorithms) and on Approximation Algorithms for computationally hard problems.