Group leader of the Centrum Wiskunde & Informatica (CWI) research group Interactive Information Access (INS2), the main topics of my research include structured document retrieval and entity ranking, multimedia information retrieval, the application of information retrieval theory to recommendation systems and social media, nearest neighbour search in high dimensional spaces, the integration of information retrieval and database technology, and the evaluation methodology needed in these novel information retrieval application areas. I am very interested into the newly proposed dataspaces abstraction.
September 1st, 2008, I have been appointed Full Professor Multimedia Dataspaces (nl) at Delft University of Technology. May 8th, 2009, I gave my inaugural lecture "Zoektocht op schema" (more to follow...). Finally, I am co-founder of the recent CWI spin-off Spinque.
Refer to my CV for a recently updated overview of professional activities. Highlights include the organization of SIGIR 2007 in Amsterdam, together with Wessel Kraaij, Djoerd Hiemstra, and Maarten de Rijke, and the coordination of the TREC Enterprise Track with Peter Bailey, Nick Craswell, Ian Soboroff and Paul Thomas. At INEX (an evaluation of structured document retrieval, or XML-IR), I have started the entity ranking track.
Former projects include the NWO Open Competition Cirquid, the MultimediaN precursor MIA, and the Senter DMW and Waterland projects. Information about my first steps in research can be found (though rather outdated) at the Mirror Research Page.