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I hold a PhD in Computer Science from the Humboldt-Universität zu Berlin, Germany, and have been awarded the academic qualification Docent in Computer Science from Linköping University.

I am interested in problems related to the management of data and databases. My focus in this broad context is on data on the Web and on graph data, as well as on problems in which the data is distributed over multiple, autonomous and/or heterogeneous sources. Regarding these topics, my interests range from systems-building related research (e.g., query processing and query optimization) all the way to theoretical foundations (e.g., complexity and expressive power of query languages).

I was honored with the SWSA Distinguished Dissertation Award in 2015 for my PhD dissertation "Querying a Web of Linked Data: Foundations and Query Execution," and with the 2019 SWSA Ten-Year Award for my paper "Executing SPARQL Queries over the Web of Linked Data" which pioneered the idea of traversal-based query execution as well as querying Linked Data on the Web in general. In addition, I have received eight best paper awards (ESWC 2009, ESWC 2015, ISWC 2017, SEMANTiCS 2018, SEMANTiCS 2019, iiWAS 2020, SEMANTiCS 2021, and CoopIS 2023), and I was selected for the prestigious Wallenberg Academy Fellows program.

I co-organized several international research workshops and conferences. Most notably, I have been research track co-chair of ISWC 2019 and in-use track co-chair of ESWC 2024. In addition, I regularly serve on scientific program committees and have participated as an invited expert in two standardization efforts of the World Wide Web Consortium.

Research groups

(of ADIT at IDA)

(at IDA)

(at IDA)