Dr. Theodoros Chondrogiannis

Post-doctoral Researcher

Theodoros joined the Database and Information Systems group of the University of Konstanz on December 2017. His research interests include route planning on transportation networks, query processing on graph database management systems, spatial network analysis and more. Currently, he is the principal inestigator for the DFG funded project "Multi-criteria Multi-constrained Path Query Processing on Graph Databases". He is also teaching the course "Graph Data Management and Analysis" every summer semmester since 2017. 

Theodoros studied computer science in his home country of Greece. He obtained his 4-year BSc degree in Computer Science and Technology with a focus on Software Systems from the Department of Computer Science and Technology of the University of Peloponnese in 2009, and his MSc degree in Advanced Information Systems from Department of Informatics and Telecommunications of the National Kapodistrian University of Athens in 2013. Afterwards, Theodoros was awarded a PhD fellowship from the Free University of Bozen-Bolzano and he started his PhD at the  Faculty of Computer Science. In 2017, he completed successfully his PhD studies and received his doctorate for his thesis entitled Efficient Algorithms for Route Planning Problems on Road Networks. After his doctorate, he continued working as a postdoctolar researcher at the Faculty of Computer Science until December 2017, when he joined the University of Konstanz.  

Notice of departure: In January 2025, Theodoros will be leaving the University of Konstanz to join the Department of Computer Science (IDI)  of the Norwegian University of Science and Technology (NTNU) as an Associate Professor.

Selected Publications 

  1. Panagiotis Bouros, Theodoros Chondrogiannis, Daniel Kowalski, Fast Geosocial Reachability Queries, EDBT 2025 paper
  2. Mehmet Aytimur, Silvan Reiner, Leonard Wörteler, Theodoros Chondrogiannis, Michael Grossniklaus. LPLM: A neural language model for cardinality estimation of like-queries. Proc. of the ACM on Management of Data 2024 paper.
  3. Theodoros Chondrogiannis, Michael Grossniklaus. Highway systems: How good are they, really? SSTD 2023 (best paper award) paper
  4. Leonard Wörteler, Moritz Renftle, Theodoros Chondrogiannis, Michael Grossniklaus. Cardinality Estimation using Label Probability Propagation for Subgraph Matching in Property Graph Databases. EDBT 2022 paper.
  5. Manuel Hotz, Theodoros Chondrogiannis, Leonard Wörteler, Michael Grossniklaus. Online Landmark-Based Batch Processing of Shortest Path Queries. SSDBM 2021 paper

You can access the complete list of publications here.

Service

Organisation

  • Publicity chair of the 18th International Symposium on Spatial and Temporal Databases (SSTD'23), 2023 
  • Co-chair of the 5th ACM SIGSPATIAL Student Research Competition, 2020 
  • Co-chair of the 4th ACM SIGSPATIAL Student Research Competition, 2019 
  • Web-chair of the 16th International Symposium on Spatial and Temporal Databases (SSTD'19), 2019 
  • Web-chair of the 30th International Conference on Scientific and Statistical Database Management (SSDBM'18), 2018 

Programme Committees

  • International Conference on Very Large Data Bases (VLDB), 2025
  • ACM SIGMOD International Conference on Management of Data, 2024 - 2025
  • ACM International Conference on Information and Knowledge Management (CIKM), 2022 - 2024
  • IEEE International Conference on Mobile Data Management (MDM) - Demo Track, 2020
  • International Conference on Database Systems for Advanced Applications (DASFAA), 2020 - 2023
  • International Conference on Web Information Systems Engineering (WISE), 2020 - 2023
  • ACM SIGSPATIAL Workshop on Recommendations for Location-based Services and Social Networks (LocalRec@ACM SIGSPATIAL), 2019 – 2024