Dr. Roman Barták works as an associate professor and a researcher at Charles University, Prague (Czech Republic). He leads Constraint & Logic Programming Research Group that is involved in activities of the ERCIM Working Group on Constraints, PLANET II and CologNet. In 1999-2004 he led research activities of Visopt BV, a multinational company located in The Netherlands, Israel, Germany, and the Czech Republic. He was a main architect of the scheduling engine developed by this company. His work focuses on techniques of constraint satisfaction and their application to planning and scheduling. Since 1998 he is teaching a course on Constraint Programming at Charles University, he had several tutorials on constraint processing at conferences and summer schools and he is an author of the On-line Guide to Constraint Programming.