Prof. Dr. Habil. Krzysztof Leśniewski (1960) is a Polish theologian. Since 1996, an employee of the Faculty of Theology in the John Paul II Catholic University of Lublin, and since 2008 the head of the Chair of Orthodox Theology at the same university. He is a member of the European Society for Ecumenical Research „Societas Oecumenica", the International Ecumenical Fellowship, Societas Scientiarum Internationalis „Fides et Ratio”. The main areas of his research: theological anthropology, spirituality of the Christian East, hesychastic diagnosis and therapy, and thanatology. He is author of four books (translated also into French, Spanish, and Lithuanian) and more than one hundred articles and chapters on Orthodox theology and spirituality. Adam Kubiś is Professor at the Faculty of Theology / Institute of Biblical Studies at the John Paul II Catholic University of Lublin. Marek Jagodziński, Prof. Dr. hab., is Professor in the Chair of the Orthodox Theology at the Faculty of Theology, The John Paul II Catholic University of Lublin, Poland, and Major Seminary in Radom, Poland. Paweł Mąkosa is Professor of Theology specializing in religious education, with research focusing on the effectiveness of religious instruction in schools and the challenges posed by youth secularization.