Marcin has been working with Demagog since 2017. He holds a degree in history and internal security from the University of Warsaw, where he developed a strong respect for reliable sources, effective information analysis, and a deep understanding of state and political systems. He has further strengthened these skills through internships at institutions such as the National Police Headquarters and the Internal Security Agency, as well as through his long-standing work at Demagog.

He has extensive experience teaching history and civics in primary schools and has worked with students through the Polish-American Freedom Foundation and the University of Warsaw School of Education. Marcin also conducts workshops and training sessions for a wide range of audiences, including students, teachers, and journalists. In this capacity, he has collaborated with organizations such as Ringier Axel Springer Polska, the Mieroszewski Centre, and the Center for Citizenship Education.

He is the author of numerous educational materials on media literacy, developed for the Fact-checking Academy and other organizations, including the Polish Scouting and Guiding Association, the Information Society Development Foundation, and OFF School.

Outside of his professional work, Marcin follows issues related to political radicalization, has a strong interest in East Africa, and supports Polonia Warsaw.