He received his Ph.D. in "Heuristic Planning Systems" from Aristotle University in 2001. His research interests include planning, scheduling and constraint satisfaction. His work can be divided in two areas: The first one concerns heuristic planning systems and resulted in the GRT planner and several variations of it, whereas the second one (and more recent) concerns personal time management, which resulted in the SelfPlanner system. He has published in ECP/AIPS/ICAPS, ECAI, JAIR and AIJ. In the past he has been involved in the organization of several ICAPS conferences, as well as the 6th International Planning Competition, whereas he was PC member at several main conferences. Currently he serves as conference chair of ICAPS-2009.