Jagiellonian University in Krakow, Krakow, Poland) and Marek Trojanowicz (Institute of Nuclear Chemistry and Technology, and University of Warsaw, Warsaw, Poland.

Paweł Kościelniak is a full professor at the Faculty of Chemistry, Jagiellonian University in Krakow, Poland. He is a head of the Department of Analytical Chemistry and a member of the Committee of Analytical Chemistry of the Polish Academy of Sciences. His scientific interest is focused on such issues as analytical calibration, interference effects and validation. He is an author of ca. 300 scientific publications.