A physician–scientist originally from Heidelberg, Germany, Gudrun Schleiermacher is a pediatric oncologist and researcher at Institut Curie, Paris, France. In addition to care for children and adolescents with cancer, she is involved in clinical and translational research programs. Her work focuses on the study of molecular mechanisms involved in cancer progression and clonal evolution in neuroblastoma and other pediatric cancers, based on biomarker studies using liquid biopsies and single-cell analysis. Her future aims are to integrate biomarkers into integrative treatment approaches while working towards a better understanding of the underlying genetic and epigenetic modifications involved in oncogenesis and tumor progression. She is also involved in personal and precision medicine approaches at a national and international level.