As head of the Chair of Archival Studies and Auxiliary Sciences of History, Father Marecki directs postgraduate studies in Archival and Library Studies. He is also a member of the Council of the Institute of National Remembrance and the Council for the National Programme of the Development of Humanities. He belongs to many academic societies in Poland and abroad, is the deputy head of the Katowice branch of the Historical Commission of the Polish Academy of Sciences, and vice-president of the Iнститут Церковниx Досліджень м. Луцьк in Ukraine. He is the author of 24 books and editor of nearly 33, has published over 200 articles in Poland and abroad and has participated in over 200 national and international conferences (in Poland and abroad). His fields of interests include: cultural landscape, archival studies, contemporary history, auxiliary sciences of history, the history of monastic communities and Christian symbols. He has written, amongst other publications: The Lexicon of Monastic Emblems, Łódź 1994(co-author, W. Kolak), Religious Orders in Poland, Kraków 2000, Religious Orders Under Pressure of Security, Security Apparatus versus Monastic Communities within the Krakow Voivodeship 1944-1975, Kraków 2009; (co-author, L. Rotter), How to Read the Images of Saints? A Lexicon of Hagiographic Attributes and Symbols, Kraków 2009. He also co-edited (with L. Rotter) a series of seven books under the common title Symbol – sign – message.