2008

• "The components of engagement in virtual art experiences", Invited talk @ e-MobiLArt Project Workshop, CULTURE 2007-13, Athens, Greece, 1-6 June 2008.

2007

• "Digital game-based informal education: the challenge of creating serious games for museums", Invited talk @ EUTIC 2007 International Colloquium “Challenges and Uses of ICT – Media and Information Diffusion: towards an open society”, Thematic Session on Digital Game-Based Learning, Athens, Greece, 8 November 2007.
• Program Chair and Session Chair @ INTUITION international conference on Virtual Reality & Virtual Environments - Athens, Greece, October 3-5, 2007.
• "H αλληλεπιδραστική τεχνολογία στην εκπαίδευση", Invited lecture @ Master's course "Τεχνολογίες της Επικοινωνίας και της Πληροφορίας για την Εκπαίδευση", Dept. of Mass Media & Communications, University of Athens, 3 July 2007.
• Invited speaker @ Municipal Museum of Kavala International Museums Day event: "The role of the contemporrary museum in the 21st century", Kavala, Greece, 25 May 2007.
• "Virtual Reality in Culture, Education, Entertainment" ("Εφαρμογές Εικονικής Πραγματικότητας στον Πολιτισμό, την Εκπαίδευση, την Ψυχαγωγία"), Invited talk @ National Event "Virtual Reality in Greece – Myth or Reality?" Perspectives, Opportunities and Activities, Athens, Greece, February 9, 2007.
  

2006

• "Από τα πολυμέσα στην εικονική πραγματικότητα: η αλληλεπιδραστική / διαδραστική τεχνολογία στην εκπαίδευση", Invited presentation @ University of Thessaly, Volos, Greece, 22 November 2006.
• "Engaging visitors in experiences with advanced digital environments", Invited speaker @ 14th DEAC Museums National Seminar, Centro Atlαntico de Arte Moderno, Canary Islands, Spain, 7-10 November 2006.
• Virtual Reality and Education: Evaluating the Learning Experience - Invited speaker @ 6th Archaeology and Education Conference "Learning in Cyberspace: new media for Heritage didactics and interpretation", Museum of the History of Catalonia, Barcelona, Spain, 26-28 October 2006.
• Programme committee member and Session Chair @ 7th medi@terra international art & technology festival "Gaming Realities: a Challenge for Digital Culture" - Athens, October 4-8, 2006.

2005

• Best Practices and Threads in VR Applications - Development Guidelines -session organiser and Chair @ 2nd INTUITION Workshop - Senlis, Paris, November 24, 2005.
• Training using VR in Industrial Applications - panelist @ 2nd INTUITION Workshop - Senlis, Paris, November 24, 2005.
• Emerging Trends in Digital Cultural Heritage Experiences - invited keynote speaker and panelist @ European Cultural Heritage: RTD Challenges Ahead workshop, organised by the Austrian Ministry of Transport, Innovation and Technology and JOANNEUM RESEARCH in collaboration with the European Commission's IST Programme, Graz, May 28, 2004.
• VR for Public Consumption workshop @ IEEE VR 2004, Chicago, March 27, 2004, with Dave Pape and Josephine Anstey. Organised a full-day workshop with over 30 presenters and over 50 registered participants. [call for participation]
• Both "virtual" and "real": "mixed" social space for art and entertainment @ Fournos Center for Digital Culture - VCMNet event, Athens, January 13, 2004 [in Greek]
• What can CG/VR computer scientists do for archeologists? @ ARC - ARCHEOS closing event, Nice, France 12/2003
• Virtual museum @ 4th year undergraduate, Dept. of Cultural Technology and Communication, University of the Aegean, Mytilene 11/2003
• Tεχνολογία στο μουσείο : «εικονική», «φορητή», «πανταχού παρούσα»? (technology in the museum: "virtual", "portable", "ubiquitous"? @ Master's course, Dept. of Cultural Technology and Communication, University of the Aegean, Mytilene 11/2003
• Combining photorealism and interactivity in VEs for design and education @ 2nd International Workshop on ICTs, Arts and Cultural Heritage, Athens 10/2003
• Museum Education & Technology @ Master's course, Dept. of Cultural Technology and Communication, University of the Aegean, Mytilene 04/2003
• Building immersive spaces & interactive content for a broad public @ SGI VizSummit '03, Paris 03/2003
• Meta-museums & evolving spaces @ ARCO '03, Madrid 02/2003

• Virtual Reality @ 3rd year undergraduate HCI course, Athens University of Economics & Business, 11/2002
• Interactive media @ Athens School of Fine Arts Multimedia seminars, Athens 03/2002
• New Platforms - Symposium chair @ Medi@terra 2002 Athens 11/02

• SGI VizSummit '01, Cortaillod Switzerland, 2001.
• Responsive Physical Environments - Session organiser and chair @ MCN/CIMI Conference, Cincinnatti USA 10/2001. Invited speakers: Clark Dodsworth, Carter Emmart, Jeff Mayer.
• Building Immersive Environments - Full day workshop orgnaniser and presenter @ MCN/CIMI Conference, Cincinnatti USA 10/2001.
• Invited Lecturer, American College of Athens Museology courses Athens 2001 & 2002

• Interactive media and Art @ Athens School of Fine Arts Multimedia seminars 2000
• Technology and the Museum @ National Technical University of Athens, Master in Architecture seminars 2000
• Virtual Reality @ Athens School of Fine Arts Multimedia seminars 2000
• VAST '00 (keynote)
• Art, Technology, Interactivity @ Cyprus Ministry of Education & Culture, Nicosia 01/2000
• Virtual Reality in heritage / education for the general public: issues & challenges @ INRIA Sophia-Antipolis, France 11/2000
• Creativity and Technology - Symposium organiser @ Medi@terra '99, Athens 11/1999. Invited speakers: Maurice Benayoun, Prof. John Kontos, Maya Kusmanovic, Dr. Vali Lalioti, Dr. Ramon Lopez de Mantaras.
• Virtual Reality @ National Center for Scientific Research "Demokritos", Athens 07/1999
• American Art Museum (Smithsonian), Washington DC 07/1998
• Block Museum of Art, Evanston IL
• School of the Art Institute Chicago, Photography Dept.