Actor and audiobook reader, a graduate of the Aleksander Zelwerowicz National Academy of Dramatic Art in Warsaw (2015). He has recorded around a thousand audiobook titles, winning numerous awards and widespread audience acclaim. Kosior is a co-founder of the Potem-o-tem independent theatre company. He has also appeared in the feature films Irena’s Vow and Piłsudski, as well as the title role in the TV production of the drama Kordian.