Dr. Andrzej Czerwiński, DSc., is a Professor at the University of Warsaw, where he is the Head of the Laboratory of Electrochemical Power Sources. In the period 1999-2019, he served as a Professor in the Industrial Chemistry Research Institute (Poland). His research interests span the areas of fundamental electrochemistry, electrochemical power sources, nuclear chemistry, radiotracer methods in electrode processes studies, catalysts in fuel cells, electrochemistry of hydrogen in palladium and its alloys,and chemistry education. Dr. Czerwiński spent several years as a Postdoc and as a Visiting Professor in the USA (University of Cincinnati), Italy (University of Camerino), Germany (Freie Universität Berlin) and Latvia (Institute of Solid State Physic in Riga). He is an author and co-author of more than 300 scientific papers, 30 patents and 16 textbooks for students. Prof. Czerwiński teaches physical chemistry, electrochemistry, nuclear chemistry, and chemistry education.  Dr. Maciej Chotkowski is an Assistant Professor at the University of Warsaw (Poland) where he also obtained his Ph.D. Dr. Chotkowski is a specialist in the application of electrochemical and spectroelectrochemical methods for the investigation of redox behavior of technetium, manganese and rhenium compounds. He is an author of more than 20 research papers and oral presentations at international conferences. Most of them deal with the fundamental properties of technetium and manganese inorganic ionic species in aqueous media. Dr. Chotkowski teaches nuclear chemistry and chemistry education.