NASA - Goddard Space Flight Center (GSFC), February 11, 2003
Institute for Advanced Study (IAS), Princeton, February 13, 2003
1st ENIGMA meeting, Mayschoss, Germany, May 11-14, 2003
Hel.A.S. meeting, Penteli, Greece, September 15-17, 2003
Virtual Astrophysical Jets meeting, Dogliani, Italy, October 2-4, 2003
4th ENIGMA meeting, Perugia, Italy, October 6-8, 2004
Gamma-Ray Burst in the Afterglow Era, 4th Workshop, Rome, Italy, October 18-22, 2004
Blazar Variability Workshop II: Entering the GLAST Era, Miami, April 10-12, 2005
National Observatory of Athens, May 19, 2005
Hel.A.S. meeting, Kefallinia, Greece, September 8-11, 2005
6th ENIGMA meeting, Kinsale, Ireland, November 22-25, 2005
SWIFT and GRBs: Unveiling the Relativistic Universe, Venice, Italy, June 5-9, 2006
Challenges of relativistic jets, Cracow, Poland, June 25-July 1, 2006
First X-ray Astronomy School, National Observatory of Athens, September 18-20, 2006
4th JETSET Summer School: From models to observations and experiments, Azores, Portugal, June 25-29, 2007
Hel.A.S. meeting, Thassos, Greece, September 13-15, 2007
High Energy Phenomena in Relativistic Outflows, Dublin, Ireland, September 24-28, 2007
RCAAM, Academy of Athens, Greece, February 21, 2008
University of Heidelberg, Heidelberg, Germany, May 27, 2008
The Central Kiloparsec: Active Galactic Nuclei and Their Hosts, Ierapetra, Greece, June 4-6, 2008
Protostellar Jets in Context, Rhodes, Greece, July 7-12, 2008
Astronomy School "The many faces of AGN", National Observatory of Athens, September 22-24, 2008
Frontiers of Space Astrophysics: Neutron Stars & Gamma Ray Bursts, Cairo & Alexandria, Egypt, March 30 - April 4 2009
Hel.A.S. meeting, Athens, Greece, September 20-24, 2009
Dipartimento di Fisica Generale, Turin, Italy, January 27, 2010
Frontiers of Nonlinear Physics, Russia, July 14, 2010
RCAAM, Academy of Athens, Greece, April 12, 2011
Edo and friends, Turin, Italy, April 29, 2011
Ginzburg Conference on Physics, Moscow, Russia, May 29, 2012
XMM-Newton Advanced X-ray School, Athens, December 13-14, 2012
The Role and the Origin of Magnetic Fields in Astrophysics, Athens, Greece, March 11-12, 2013
Physical Processes in Astrophysical Plasmas, Inflow/Outflow and Stellar Winds, Turin, Italy, March 12-14, 2013
Observatoire de Paris, Meudon, France, June 4, 2013
The innermost regions of relativistic jets and their magnetic fields, Granada, Spain, June 10-14, 2013
Accretion and Outflows throughout the scales: from young stellar objects to AGNs, Lyon, France, October 1-3, 2014
Hel.A.S. meeting, Thessaloniki, Greece, June 28 - July 2, 2015
RCAAM, Academy of Athens, Greece, March 8, 2016
EWASS 2016, Athens, Greece, July 4, 2016
Centre for mathematical Plasma Astrophysics, KU Leuven, Belgium, September 13, 2016
Hel.A.S. meeting, Heraklion, Greece, July 2-6, 2017
JETSET FP6, ``Jet Simulations, Experiments, Theory'' 10 years later, what is next?, Meudon, France, May 22, 2018
Hel.A.S. meeting, Volos, Greece, July 8-11, 2019
University of Crete, Department of Physics, November 7, 2019
University of Ioannina, Department of Physics, May 20, 2022
University of Patras, Department of Physics, February 2, 2023
Hel.A.S. meeting, Athens, Greece, June 26 - 28, 2023
Hel.A.S. General Assembly, Athens, Greece, June 28, 2024
Princeton Athens Center, Athens, Greece, July 2, 2024