Johann Bornholdt leads the Data Systems Research Group at the Thurgau Institute for Digital Transformation (TIDIT), which he joined at the beginning of 2026. His research focuses on data models, query languages, and database systems that treat trajectory data as first-class citizens, enabling advanced analytics in domains such as mobility and environmental sciences.
He earned his PhD in Computer Science at the University of Konstanz. Before his doctorate, he worked as a software developer at SEITENBAU GmbH in Konstanz on projects for clients including Deutsche Telekom and the German Bundestag.
Research interests
- Trajectory Data Systems
- Database Systems Design
- Query Optimization
Publications
- Johann Bornholdt. Building a System for Trajectory Data Management and Analysis. Dissertation, University of Konstanz, 2026. kops.uni-konstanz.de
- Johann Bornholdt, Theodoros Chondrogiannis and Michael Grossniklaus. Trajectory Data Management: A Data Model and Predicate Logic with Operators for Spatio-Temporal Query Processing. Information Systems 135, 2026. doi:10.1016/j.is.2025.102595
- Max Galetskiy, Johann Bornholdt, Theodoros Chondrogiannis and Michael Grossniklaus. A Qualitative Evaluation of Distance Measures in Trajectory Data Clustering. SIGSPATIAL 2025. doi:10.1145/3748636.3762735
- Johann Bornholdt, Theodoros Chondrogiannis and Michael Grossniklaus. A Data Model and Predicate Logic for Trajectory Data. ADBIS 2024. doi:10.1007/978-3-031-70626-4_2 (Best Paper Award; extended version on arXiv)
- Johann Bornholdt. A System for Trajectory Data Management and Analysis. EDBT/ICDT Workshops 2023. ceur-ws.org/Vol-3379
- Theodoros Chondrogiannis, Johann Bornholdt, Panagiotis Bouros and Michael Grossniklaus. History Oblivious Route Recovery on Road Networks. SIGSPATIAL 2022. doi:10.1145/3557915.3560979
Full list on Google Scholar.
Curriculum vitae
Positions
- 2026–present — Group Leader, Data Systems Research Group, Thurgau Institute for Digital Transformation, Kreuzlingen
- 2017–2020 — Software Developer, SEITENBAU GmbH, Konstanz
- 2014–2016 — Research Assistant, University of Konstanz
Education
- 2020–2025 — Ph.D. in Computer Science (Database Systems), University of Konstanz
- 2013–2016 — M.Sc. in Computer and Information Science, University of Konstanz
- 2009–2013 — B.Sc. in Business Informatics, HTWG Konstanz
Teaching
- 2024–2025 — Big Data Management and Analysis (teaching assistant), University of Konstanz
- 2021–2024 — Database System Architecture and Implementation (teaching assistant), University of Konstanz
- 2014 — Database Systems (teaching assistant), University of Konstanz
Elsewhere
Contact
Email: johann.bornholdt@tidit.ch