His main research interests have addressed Human Computer Interaction, User Centred Design, Mobile Interface Design, Pervasive Computing, Hypermedia, Groupware, Accessibility, and Ehealth. He received his PhD (2000) in Electrical and Computer Engineering from the Technical University of Lisbon. He has published more than one hundred articles in journals, books, and conferences, and participated in more than eighteen research and development projects, six of which international. He was a member of more than fifty program committees and he is an invited reviewer and evaluator for the European Commission. He is the leader of the AbsInt (Absolute Interaction) team, at the HCIM (Human Computer Interaction and Multimedia) Group, and a senior researcher at LaSIGE (Large Scale Informatics Systems) research unit.