Mark van Harmelen is an independent consultant who has been involved with object-oriented technology and human-computer interaction since 1985. Mark is also an Honorary Research Fellow in the Department of Computer Science at the University of Manchester, U.K. Previously Mark has been a Senior Researcher at Matsushita's (Panasonic's) Tokyo Research Laboratory, a tenured member of the academic staff at Manchester University, and has held various positions in industry. He has degrees in Computer Science and Psychology, including a Ph.D. in Computer Science. He started working on the integration of object modeling and user interface design in 1991, and initiated worldwide cooperation in the field in 1997. He continues to foster this cooperation.