Dr. Kalliontzis is an active member of the following Committees and Organizations:

Other Professional Service and Outreach Activities:

  • Chair of the Student Competition for the 2026 4th International Interactive Symposium on Ultra-High Performance Concrete (4IISUHPC).

  • Member of the Scientific Committee for the 2026 International Masonry Conference.

  • Gave several expert-opinion interviews for the 2024 Houston Derecho event.

  • Member of the Scientific Committee for the 2023 3rd International Interactive Symposium on Ultra-High Performance Concrete (3IISUHPC).

  • Invited External Examiner for the Final Thesis Defense of a PhD Candidate in the University of Alberta, Canada (2025).

  • Participated in the NICHE Workshop “Designing the World’s Largest Wind-Wave Research Facility” DesignSafe-CI (2024).

  • Organized UH Educational Masonry Days (2022-2023).

  • Participated in several reconnaissance (PVRR and EARR) reports of StEER for historic tropical storms and hurricanes (2022-2024).