Dr. Walczak received his medical degree from the Medical University of Warsaw and PhD in regenerative medicine from the University of Warmia and Mazury in Poland followed by postdoctoral training at the University of South Florida and the Johns Hopkins University. He served on a faculty at Hopkins until 2019 when he joined UMB Department of Diagnostic Radiology and Nuclear Medicine.

His research is focusing on developing advanced tools for guiding brain repair strategies. His lab utilizes animal models and multimodal imaging at various scales, including MRI, PET and intravital microscopy, to interrogate mechanisms and improve efficacy of therapeutic agents, such as stem cells, macromolecules and gene therapeutics.