Assoc. prof. of UW; specialist in the ecology of aquatic microorganisms, especially issues related to the activity of ectoenzymes and the role of bacteria in the circulation of phosphorus; from the beginning of his scientific work he has been associated with the Institute of Microbiology of the University of Warsaw, now he is a Head of the Department of Ecology of Microorganisms and Environmental Biotechnology of the Institute of Botany, University of Warsaw.