Yannis received his Diploma in Physics from the University of Athens-Greece, his MSc in Computer Science from University College London, and his PhD in Informatics from the National Technical University of Athens. He worked as a software engineer at a private company (1993-1997), as a research associate at the National Center for Scientific Research "Demokritos" (1998-2003), and as an adjunct professor at the University of Thessaly and the University of Central Greece (2004-2006). Since 2007 he is a researcher at the Institute for the Management of Information Systems of the Research Center "Athena".