My general research area is data management, and much of my research concerns foundations for value creation from temporal, spatial, spatio-temporal, geo-textual, and multidimensional data, including data modeling, database design, data models and query languages, query and update processing, data mining, machine learning, and indexing.
I am Professor of Computer Science, and 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. From January 107 to November 2018, I was am Ph.D. study director of the Ph.D. school Technical Doctoral School of IT and Design, an independent unit established by the Technical Faculty of IT and Design as of January 1, 2017. Some 200 Ph.D. students were enrolled in the school.
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.