JAKONIUK LESZEK MARIUS, Rev., was born in 1976. He obtained his a Licentiate of Theology at the Cardinal Stefan Wyszyński Univer- sity 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 Managing Editor of the publication Annual of Catholic Theology and as the Managing Editor 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 Department of Catechesis. His research interests include: the dimensions of the liturgy and cateche- sis 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: Pedagogical Principles of Culture in Pope Francis’ Exhortation “Gaudete et exsultate” (“Rocznik Teolo- gii Katolickiej” 2023), 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 Perspec- tive (Białystok 2017), L’Exultet – une catéchèse vécue (Białystok 2013), L’Exultet – La Bonne Nouvelle chantée (Białystok 2012).