LESZEK MARIUS JAKONIUK, Rev., was born in1976. He obtained his a Licentiate of Theology from the Cardinal Stefan Wyszyński University in Warsaw. He completed a special course in catechetics (pedagogie de la foi) at the Catholic University of Paris and he completed his third degree doctoral studies at the University of Strasbourg in France. Since 2014, he has worked in the Department of Catholic Theology at the University of Białystok and served as the Editorial Secretary of the publication Annual of Catholic Theology and as the Editorial Secretary of Studies on Dogmatic Theology. Member of the Association of Polish Catechists. President of the Mess’AJE Polska Association, which promotes adult biblical catechesis in Poland, Vice Director of the Metropolitan Curia of Białystok’s Depart- ment of Catechesis. His research interests include: the dimensions of the liturgy and catechesis that are conducive to the growth of the Church as a community, ecclesial identity in a united Europe, subjectivity in intercultural and interfaith dialogue, and adult biblical catechesis. He has authored and co-authored many articles inter alia: Exsultet (wymiar katechetyczny), in: Leksykon katechetyczny (Kielce 2022), Les chants de Taizé (Paris, 2021), Archbishop Edward Kisiel: The “Primary Catechist” of the Diocese (Białystok, 2018), The French and Polish Versions of the Catechism of the Catholic Church: An Examination of Certain Passages of the Catechism’s Teaching on the “Mysterium Ecclesiae” from a Philological and Translational Perspective (Białystok,2017), L’Exultet–une catéchèse vécue (Białystok, 2013), L’Exultet – La Bonne Nouvelle chantée (Białystok, 2012).