Mariusz is a structural biologist experienced in single particle cryo-EM, X-ray crystallography and various biophysical methods for analysis of proteins and protein complexes. His scientific interests are focused around mechanisms and structural aspects of gene expression regulation in Eukaryotes. He received his PhD from the University of Warsaw in 2015 and is currently a postdoctoral researcher in the Laboratory of Protein Structure at the International Institute of Molecular and Cell Biology in Warsaw. He was involved in the organization of cryo-electron microscopy laboratory at IIMCB Warsaw and he has experience in all steps of single particle cryo-EM, from sample preparation to data processing. He gained his experience with cryo-electron microscopy during his everyday work at IIMCB, during his visit at the European Molecular Biology Laboratory (EMBL) in Grenoble, and as an user of several cryo-EM facilities in Europe. He also attended several cryo-EM trainings and workshops, covering operation of all ranges of microscopes (Tecnai T12 at IIMCB Warsaw, 2017; Glacios at CeNT, Warsaw, 2019; Krios at Solaris, Kraków, 2019) and cryo-EM model building (Madrid, 2019).