1983
“Determinism and Indeterminism in Ancient Atomic Theory and in Contemporary Physics.” 1st International Conference on Democritus, October 6-9, Xanthi-Greece.
1986
“Charles S. Peirce’s Theory of Truth.” Philosophy of Science Conference, Inter-University Centre Dubrovnik-Yugoslavia.
1986
“Popper’s Propensities: An Ontological Interpretation of Probability.” “Criticism and the Growth of Knowledge: 20 years After.” International Conference in Memory of I. Lakatos. Thessaloniki-Greece.
1987
“Models of Change: A Common Ground for Ancient Greek Philosophy and Contemporary Science.” Philosophy of Science Conference, Inter-University Centre Dubrovnik-Yugoslavia.
1989
“The Role of Potentiality in C. S. Peirce’s Tychism and in Contemporary Discussions in Q.M. and Micro-Physics.” C. S. Peirce Sesquicentennial Conference, September 5-10, Harvard University, Cambridge, Mass.-USA.
1989
“Peirce and Idealism,” C. S. Peirce Sesquicentennial Conference, Plenary Session. September 5-10, Harvard University, Cambridge, Mass.-USA.
1989
“The Reality of the Unobservable: C. S. Peirce’s Account of Physical Theory.” Philosophy of Science Conference, Inter-University Dubrovnik-Yugoslavia.
1990
“The Reality of the Unobservable in Physical Theory: An Account of C. S. Peirce’s Pragmatic Realism.” The American Philosophical Tradition Conference, March 1-4, State University of New York. Buffalo-U.S.A.
1990
“Fallibilism and Truth: An Anti-Cartesian Alternative both to Dogmatism and Scepticism.” Third International Conference on Relativism, Scepticism and their Anti-dogmatic Criticism. Ancient Olympia-Greece.
1990
“Is There a Logic of Scientific Discovery? A Pragmatic-Realist Account of Rationality in Physical Theory. “1st Greek-Soviet Conference on “Historical Types of Rationality,” “Science and Society.” Athens-Greece.
1992
“Some Reflections on the Nature of Laws of Nature.” Philosophy of Science Conference. Inter-University Centre Dubrovnik-Croatia.
1992
“The Reality of Thirdness: A Pragmatic-Realist Account of Scientific Inquiry.” Beijing International Conference on Philosophy of Science, June 15-17. Beijing-China.
1993
“Peirce and Aristotle.” International Conference on Hellenism and the U.S.A., May 20-23, Aristotle University of Thessaloniki. Thessaloniki-Greece.
1993
“Materia Prima: A Principle of Unity in Nature.” & “Continuity as a Unifying Principle of Science.” The World Congress on Universalism, August 15-20. Warsaw-Poland.
1993
“Aristotelian Prime Matter: An Old Lens for a New Look at Modern Theories of Matter” & “C. S. Peirce on Laws of Nature.” XIX World Congress of Philosophy: “Mankind at a Turning Point.” August 22-28, Moscow-Russia.
1995
“Can Schroedinger’s Cat be both Dead and Alive? An Attempt at an Aristotelian Account.” Philosophy of Science Conference. Inter-University Centre Dubrovnik-Croatia.
1995
“The Non-Observable and the Development of Technology in Science” (in Greek). 7th Pan-Hellenic Conference of Philosophy “Technology and Values,” November, 1995. Patra-Greece.
1997
“What is Matter for Aristotle: A Clothes Horse or a Dynamic Principle in Nature?” International Conference “Aristotle and Contemporary Science,” 1-4 September, 1997, Aristotle University of Thessaloniki. Thessaloniki-Greece.
1997
“Seminaire Ilya Prigogine: Penser la Science,” Université Libre de Bruxelles, (invited discussant). 13-16 November, 1997. Bruxelles- Belgique.
1998
“The Arrow of Time in Prigogine.” Philosophy of Science Conference, April 1998. Inter-University Centre Dubrovnik. Dubrovnik-Croatia.
2001
“Time and becoming in Aristotle and in Prigogine” (in Greek). International Conference “Aristotle Today,” 22-23 September, 2001. Naoussa-Mieza.
2001
“Aristotle’s Prime Matter and Contemporary Physics” (in Greek). 6th Pan-Hellenic Conference “Aristotle Today,” October 19-21, 2001. Ierissos-Chalkidiki.
2001
“The Theory of Tragedy and of Science: Some Remarks on van Fraassen’s Empiricism” (in Greek). International Conference on Aristotle’s Poetics. December 5, 2001. Athens-Greece.
2004
“Aristotle’s Prime Matter through the Looking-Glass of Quantum Mechanics and Physics of Elementary Particles” (in Greek). International Conference “Aristotle as a Βridge between East and West,” April 28-29, 2014, Panteio University. Athens-Greece.
2005
“The Relation between Philosophy and Science as Part of our Culture, through a Contemporary Reading of Aristotle” (in Greek). International Conference “The philosophy of Culture,” August 1-7, 2005. Samos & Patmos-Greece.
2006
“Looking for the Real behind Bas van Fraassen’s Theatre of Representations” (in Greek). 10th Pan-Hellenic Conference of Philosophy, “The Philosophy of the Sciences.” Greek Philosophical Society & Department of Philosophy, May 6-8 2006, Aristotle University of Thessaloniki. Thessaloniki-Greece.
2006
“Aristotle’s Materia Prima: A Discussion in the Light of Contemporary Physics.” International Conference “Aristotle and the Aristotelian Tradition,” December 10-13, Centro Interuniversitario per la Storia della Tradizione Aristotelica. Padova-Italy.
2007
“Peirce and Aristotle on Time.” 10th International Meeting on Pragmatism, November 12-15. Sao Paulo-Brazil.
2007
“The idea of Consiousness in Philosphy.” Round-table on “Consciousness,” in the context of the 3rd International Congress on Brain and Behaviour, Nov. 28-Dec. 2, 2007. Thessaloniki-Greece.
2008
“Aristotle’s Prime Matter: An Examination in the Light of Contemporary Physics” (in Greek). Conference on “Matter and Dynamis,” March 4-5, School of Philosophy, University Patras. Patra-Greece.
2008
“Aristotle and Prigogine on Time.” International Conference “Aristotle and the Aristotelian Tradition.” June 12-14, 2008. Lecce-Italy.
2008
“Bas Van Fraassen’s Argument from Hallucination and the Quest for the Real Behind Representations.” XXII World Congress of Philosophy, “Rethinking Philosophy Today,” July 30-August 5, 2008. Seoul-Korea.
2009
“Philosophical Consequences of Darwin’s Theory of Evolution and its Relation to Aristotle,” Conference Darwin 200 Years After. Man, Society, Evolution, Faculty of Biology, December 17, 2009, Aristotle University of Thessaloniki. Thessaloniki-Greece.
2010
“Contemporary Philosophy of Science and its Foundation in Aristotle.” Pan-Hellenic Conference on “Philosophy of Science,” October 15-17, 2010, Department of Philosophy and History of Science, University of Athens. Athens-Greece.
2011
«Aristotle and Contemporary Physics». 1st Pan-Hellenic Conference of Greek Physicists. «Physical Sciences and New Technologies». October 14-16 University of Macedonia. Thessaloniki-Greece.
2011
«The Issue of Aristotle’s Direct Realism in Light of Contemporary Discussions on Mental Representations». International Conference, International Conference «Ripensare il copro e la mente alla luce del de Anima» Centro Interuniversitario per la storia della tradizione Aristotelica». 26-28 October 2011. Palermo- Italy.
2013
“The Issue of Aristotle’s Direct Realism in Light of Contemporary Discussion on Mental Representations.” Workshop on “Scientific Realism” (Thales Project). Department of Philosophy and History of Science, 1-2 March, 2013, University of Athens. Athens-Greece.
2013
“Aristotle and Contemporary Physics. What is ‘Prime Matter’ for Aristotle?” Invited Session “Aristotle and Contemporary Scientific Thought.” 23rd World Congress of Philosophy, August 4-10, 2013, University of Athens. Athens-Greece.
2013
“An Overall Appreciation of the Philosophy of Evanghelos Moutsopoulos.” Paper presented at the Round-Table, “The Polyvalence of Evanghelos Moutsopoulos Philosophy.” 23rd World Congress of Philosophy, August 4-10, 2013, University of Athens, 2013. Athens-Greece.
2013
“The Role of ‘εἶδος’ in Aristotle’s Theory of Perception, Knowledge and the Structure of the World.”Round-Table, “Aristotle and the Aristotelian Tradition.” 23rd World Congress of Philosophy, August 4-10, 2013, University of Athens. Athens-Greece.
2014
“Peirce and Aristotle: A Neo-Aristotelian Version of Scientific Realism.” Charles Peirce International Centennial Congress, “Invigorating Philosophy for the 21st Century,” July 16-19, 2014, University of Massachussetts Lowell-USA.
2014
Aristotle and Contemporary Scientific Realism. A Neo-Aristotelian Proposal towards Enlarging Bas van Frassen’s Constructive Empiricist View of the Real. XI International Ontology Congress, “Old Questions on Physics, Contemporary Approaches,” October 1 – 7, 2014. San Sebastian & Barcelona-Spain.
2014
“Aristotle and Contemporary Physics.” International Conference “Aristotle and Contemporary Science: Celebrating the 60th Anniversary of CERN,” organized by the “Interdisciplinary Centre for Aristotle Studies” & the “European Organization for Nuclear Research” (CERN), October 30-31, 2014, Aristotle University of Thessaloniki. Thessaloniki-Greece.
2015
Charles S. Peirce’s Tychism and its Relevance to Contemporary Physics.” Presidential Address at the General Assembly of the “Charles S. Peirce Society,” in the context of The American Philosophical Association Annual Meeting, February 18-21, 2015. St. Louis, Missouri-USA.
2015
“Potentiality as the Core of Aristotle’s Dynamic Model of Nature in the Light of Contemporary Science.” International Seminar on Aristotle: “Energeia and Dynamis in Aristotle,” October 14-16, 2015, University of Lisbon. Lisbon-Portugal.
2015
“Aristotle as the Founder of Contemporary Scientific Realism” (in Greek). International One-day Conference “Aristotle as the Founder of Contemporary Scientific Realism,” organized by the “Interdisciplinary Centre for Aristotle Studies,” December 14, 2015, Aristotle University of Thessaloniki. Thessaloniki-Greece.
2016
Aristotle’s Dynamic Vision of Nature: The Case of ‘Prime Matter’ (πρώτη ὕλη). A Neo-Aristotelian Perspective on Contemporary Science.” World Congress “Aristotle 2400 Years,” May 23-28, 2016, Aristotle University of Thessaloniki, ancient Stageira, ancient Mieza-Greece.