He has a passion for research that involves the activities, processes and experiences arising in the meeting between users, information, and information systems in a given context - with the goal of optimising these to empower users in their task and problem solving. His main research interests include Information Retrieval (IR), structured documents in IR, XML IR and user interaction, domain specific search, understanding user intents and exploiting context in IR, as well as Informetrics/Bibliometrics, citation analysis and quantitative research evaluation.