My general research area is data management, and much of my research concerns aspects of the management of temporal, spatial, and spatio-temporal data, including data modeling, database design, data models and query languages, efficient query and update processing, indexing, and systems architectures.
I am Obel Professor of Computer Science, a position made possible by a generous grant from the Obel Family Foundation. I direct Center for Data-Intensive Systems with co-director Torben Bach Pedersen.
During the late 1980s and the 1990s, I was at the computer science departments at University of Arizona (on sabbaticals) and University of Maryland (as a Ph.D. student) for a total of about five years. From September 2008 to August 2009, I was a Visiting Scientist at Google, Mountain View, working in the structured data research group headed by Alon Halevy. From August 2010 to July 2013, I was a Professor in Department of Computer Science at Aarhus University. In August 2013, I returned to Aalborg University, where I had been a faculty member since the early 1990s.
I am an ACM Fellow (for contributions to temporal and spatio-temporal data management) and an IEEE Fellow (for contributions to temporal, spatio-temporal and mobile data management); and I am a member of the Academia Europaea, the Royal Danish Academy of Sciences and Letters, and the Danish Academy of Technical Sciences.