• Pedagogical research, urban and rural schools, Pedagogical center for research and education, Krypigi, Kassandra, Greece, 1989.
• 2nd European Ph. D. Summer School, on European Research in Science
• Education: "Early Childhood Teachers Ideas on Physical Science Concepts", Leptokaria, Greece, August 1994.
• 4th European conference of the European Early Childhood Education Research  Association (EECERA) on The Quality of Early Childhood Education: "Kindergarten Teachers Ideas on Physical Science Concepts", Goteborg, Sweden, September 1994.
• 1st International conference of the European Science Education Research Association (ESERA), "Teacher Education",  Rome, Italy, August 1997.
• 1st National Greek Conference on Didactics of Science and New Technologies: "The science curriculum in the kindergarten classroom: Convergence and divergences between propositions and reality", Thessaloniki, Greece, May 1998.
• 2nd International conference of the European Science Education Research Association (E.S.E.R.A.), Research in Science Education Past, Present and Future: "Science in kindergarten: The classroom reality of teachers’curriculum implementation activities",  Kiel, Germany, August 1999.
• 1st Greek conference on Science in Preprimary Education: "Early years teachers ideas on concepts of physics and natural phenomena", Patras, Greece, December 1999.
• 1st Greek conference on Science in Preprimary Education, "Science activities in the kindergarten: The curriculum and the reality of the classroom", Patras, Greece, December 1999.
• 10th International conference of the European Early Childhood Education Research Association (EECERA)  Complexity Diversity and Multiple Perspectives in the Early Childhood:  "Science activities in the kindergarten: The curriculum and the reality of the classroom", Institute of Education, University of London, UK, August 2000.
• 3rd Greek conference of OMEP, Post graduate studies: Developments and perspectives in preschool and lower elementary education: "Early years teachers ideas on the concepts of physics: A study of their knowledge and teaching practices",  Athens, Greece, September 2000.
• 3rd International conference of the European Science Education Research Association (E.S.E.R.A.), Science Education Research in the Knowledge Based Society: "Science and pseudoscience in the early-years classroom: the educators attitudes to astronomy and astrology", Thessaloniki, Greece, August 2001.
• 2nd Greek Conference on Science in Preprimary Education: "Pseudoscience and superstition in the early years classroom", Thessaloniki, Greece, December 2001.
• 4th International conference of the European Science Education Research Association (E.S.E.R.A.), Anthropomorphism and animism in early years science: Why teachers use them and what are their views on their use",  Nordwijkerhout, The Netherlands, August 2003.
• Workshop: “eaching science in elementary school and preschool” "Developing science process skills in children of preschool age", Department of Education Aristotle University of Thessaloniki (the Florina campus), Greece, October 2003.
• 3rd Greek Conference on Science in Preprimary Education: "Problems and needs of in-service early years’teachers in science as these are perceived by the teachers themselves: an exploratory study", Nicosia, Cyprus, January 2004.
• 4th National Greek Conference on Didactics of Science and New Technologies: "Triangulation: Theoretical introduction and applications", Athens, Greece,  November 2004.  
• 5th International conference of the European Science Education Research Association (E.S.E.R.A.), "Modeling didactical activities in the preprimary science classroom".  Barcelona, Spain, August 2005.
• 4th National Conference on Science in the Early-Years Education: "Modeling didactical activities in the early-years science classroom",  Volos, Greece, June 2006.
• 5th National Greek Conference on Didactics of Science and New Technologies in Education":  "Upgrading early years teachers' knowledge in science through their participation in inquiry processes and action research". Ioannina, Greece, March 2007.
• 6th  International conference of the European Science Education Research Association (E.S.E.R.A.):  "Astronomical concepts and events awareness for young children", Malmo, Sweeden,  August 2007.
• 6th  International conference of the European Science Education Research Association (E.S.E.R.A.),: "Learning through practice and Action Research in Early-Years teachers' professional upgrading in science", Malmo, Sweeden,  August 2007.
• GIREP (International Research Group on Science Teaching) conference (2008), “eveloping an ICT-based Inquiry-oriented Teaching Learning Sequence about Thermal Properties of Materials in the context of the European Project on Materials Science” (D. Psillos, E. Hatzikraniotis, A. Molohidis, M. Kallery, A. Barbas, G. Bisdikian, I. Lefkos), Cyprus, August, 2008.
• EP (Expert Panel) meeting of “aterials Science:  University-school partnerships for the design and implementation of research-based ICT-enhanced modules on Material Properties” Program:  “eat conduction module implementation: Some preliminary results” the ‘hessaloniki, Group’ Kallery, M., Helsinki, June 2008.
• 5th  Greek conference with International Participation in Science In the Early Years. Approaching Concepts and Phenomena of outer space in preschool and Early years Education, Kallery, M.,  Ioannina November 2007.
• 6th   National Greek Conference on Didactics of Science and New Technologies:  “ctivities from Physics and Astronomy for Preschool and Early Elementary grades” Kallery, M., Florina, Greece, May 2009.
• 6th National Greek Conference on Didactics of Science and New Technologies in Education": Poster Session: “esign of an inquiry oriented TLS for the thermal properties of materials” Psillos, E. Hatzikraniotis, A. Molohidis, M. Kallery, A. Barbas, G. Bisdikian, Florina, Greece 2009.
• Workshop: “ethodological issues in Physics and Astronomy activities for early years’education”  Kallery, M., June 2009.
• 7th  International conference of the European Science Education Research Association (E.S.E.R.A.): Introducing Floating and Sinking in the Preschool Employing Activities Developed Through a Collaborative Partnership Approach, Kallery, M., Istanbul, Turkey, August-September 2009.  
• 7th  International conference of the European Science Education Research Association (E.S.E.R.A.):  Poster Session: Development and Evolution of a TLS about Thermal Properties of Materials as a Collaborative Activity of Researchers and Teachers,  Psillos, E. Hatzikraniotis, A. Molohidis, M. Kallery, G. Bisdikian, A. Taramopoulos. Istanbul, Turkey, August-September 2009.  
• 7th  International conference of the European Science Education Research Association (E.S.E.R.A.):  Enhancing Students’Understanding of Thermal Conductivity of Materials Through an Inquiry Oriented TLS. Psillos, E. Hatzikraniotis, A. Molohidis, M. Kallery, G. Bisdikian, Istanbul, Turkey, August-September 2009.  
• 9th National Conference of the Hellenic Astronomical Society: «Astronomical Concepts and Events Awareness for Young Children», M. Kallery, September 2009, Athens, Greece.
• 7th National Greek Conference on Didactics of Science and New Technologies in Education: “earning in small groups: The role of age and interactions” Kallery, M., Alexandroupolis, Greece,  April 2011.
• 8th   International conference of the European Science Education Research Association (E.S.E.R.A.):  “earning Science in small groups:  The role of age and interactions” Kallery, M.,  Lyon, France, September 2011.
• 8th National Greek Conference on Didactics of Science and New Technologies in Education: “ ‘ollaborative- partnership’approach of activities’development as a method for improving teachers’knowledge” Kallery, M. , Volos, Greece,  April 2013.
• 9th International conference of the European Science Education Research Association (E.S.E.R.A.): “n quest of teaching quality in preschool science: Teacher views of factors influencing their work”  Kallery, M., Nicosia Cyprus, September 2013.

• 10th International conference of the European Science Education Research Association (E.S.E.R.A.). “A ‘Collaborative Partnership’ Perspective on the Development of Activities for Professionally Upgrading Early-Years-Teachers in Science”.  Kallery, M., Helsinki Finland, September 2015.

• Keynote Presentation: "Teachers’Explanations of Natural Phenomena".
  In "Primary School Science Symposium" - Organized by:  The Royal Dublin   Society (RDS) in association with the Centre for the Advancement of Science Teaching and Learning (CASTeL).   Dublin, Ireland, 16th of June 2007.
• Invited Colloquium: “Teaching Physics and Astronomy in the Early-Years”
  The joint Physics Colloquium of AlbaNova University Center (Stockholm University and Royal Institute of Technology)  and Nordita (Nordic Institute of Theoretical Physics). Stockholm, Sweden, 30th of August 2007.
  http://agenda.albanova.se/categoryDisplay.py?categId=2
  http://agenda.albanova.se/conferenceDisplay.py?confId=299

• Presentation in the Invited symposium:  “Towards research informed approaches to teacher education in early-years science”. Title of presentation: A ‘Collaborative Partnership’ Perspective on the Development of Activities for Professionally Upgrading Early-Years-Teachers in Science’. Helsinki, Finland, 4th of September 2015.
  http://www.esera2015.org/programme/detailed-programme/parallel-sessions/?session=119

• Participation in the Research Program: “Μaterials Science: University-school partnerships for the design and implementation of research-based ICT-enhanced modules on Material Properties” 2007- 2009: Development of a Teaching Learning Sequence for the thermal properties of mater. Funded by the European Union.
• Participation in the Research Program "Development of Teaching-Learning Sequences for the teaching of the concept of force to prospective elementary teachers" P. Kariotoglou (P.I.).  Funded by the program PYTHAGORAS of the Ministry of Education of Greece, 2004-2007.
• European Science Educators’ Exchange program, Istituto Bernini, Rome, Italy, February 1994.

• for the “International Journal of Early years’ Education”
• For the Journal “Science Education”
• For the Journal “Research in Science Education” (RISE)
• For the “International Journal of Science Education”
• For the “International Journal of Education in Mathematics, Science and Technology”

• For the Journal “Preschool and Primary Education”.

• Member of the European Science Education Research Association (ESERA).
• Member of the Society "Friends of the Science Museum", NOESIS Thessaloniki, Greece.

Co-Editors:

• Bodil Sundberg and Maria Kallery. Chapter: ‘Early Years Science Education in Research, Practice and Collaboration in Science Education’. Proceedings of the ESERA 2017, ISBN 978-1-873769-84-3

• Sofianidis Agelos (2019):  Development and implementation of an evaluation system for science teachers based on Pedagogical Content Knowledge.
• Kardaras Ioannis (2021): Inquiry learning: Development, Implementation and Evaluation of a Teaching Learning Sequence in the E/M spectrum of Stellar sources.
• Toli Georgia (2021): Development, implementation, and evaluation of methodology for motivating the learning of Physics in Secondary Education: the case of energy.