Dr Christopher Walton is a senior research fellow in the Centre for Intelligent Systems and their Applications at the University of Edinburgh. He has been closely involved in the Multiagent Systems and Semantic Web communities since the completion of his PhD in 2001. He is currently employed on the EU-funded Open Knowledge (OK) project (www.openk.org) which is principally concerned with the advancement of agent-based techniques for knowledge management on the Semantic Web.