- Director of the Post-Graduate Programme of the School of Sciences of the University of Athens on «Oceanography and Management of the Marine Environment».
- Director of the Post-Graduate Programme of the University of Athens on «Prevention and Management of Natural Disasters».
- Director of the Laboratory on «Study and Prevention of Natural Hazards» of the University of Athens.
- Grosby professor, Department of Earth, Atmospheric and Planetary Sciences, M.I.T. (Massachusetts Institute of Technology), Cambridge, Boston, USA.
- Barnes Distinguished Lecturer, Jackson School of Geosciences, University of Texas, Austin, USA.
- f. President and Director of the National Centre for Marine Research (NCMR).
- f. President of the Earthquake Planning and Protection Organization (EPPO).
- f. Secretary General of Civil Protection of the Ministry of Interior.
- f. Associate Professor, Université de Reims, France.
- f. President of the Geological Society of Greece.
- f. President of the Carpatho-Balkan Geological Association
- f. Project Leader, IGCP 276 of UNESCO / IUGS (International Geological Correlation Programme of International Union of Geological Sciences).