Jean-Luc Nancy is Professor Emeritus of Philosophy  at the University of Strasbourg in France. Invited professor in numerous universities (Berkeley, Berlin, Palerme, Tokyo, Stockholm, etc.), he is uthor of a large number of books, especially on community, art, body (the most of them translated in English, Deutsch, Spanish).
He has given conferences for children (the most of them being published).

David J. Elliott is Professor of Music and Music Education and Director of Doctoral Studies in Music Education at New York University. Ηe studied with musicians like Ralph Sauer, Chuck Dallenbach, philosopher Francis Sparshott & composers R. Murray Schafer and Gordon Delamont. He is co-author (with Marissa Silverman) of Music Matters: A Philosophy of Music Education, 2nd edition (2015), author of Music Matters: A New Philosophy of Music Education (1995) & Praxial Music Education: Reflections and Dialogues (Oxford, 2005/2009) & co-editor of Artistic Citizenship: Artistry, Social Responsibility, and Ethical Praxis (2016). He has presented more than 300 keynote papers/invited university lectures in 47 countries. He is also an award-winning jazz composer/arranger.