Cyrille Koné was visiting professor at Martin Luther University Halle-Wittenberg. He is the director of Centre d’études sur les Philosophies, les sociétés et les savoirs (CEPHISS) – Center for studies on philosophies, societies and knowledges, at Joseph Ki-Zerbo University. He published several articles and books on metaphysics, ethics, aesthetics in Africa, African civilization.Matthias Kaufmann studied mathematics, philosophy and political science. 1992 habilitation with a work on reference and truth in William Ockham. During 1995–2020 he was a professor in philosophy (ethics) at the Martin-Luther-Universität Halle-Wittenberg. His main fields of work are political philosophy, philosophy of law, applied ethics and early modern philosophy.