Marc Seifert graduated in Biology at the University of Cologne and did his PhD at the Institute of Cell Biology (IFZ) at the University Hospital Essen. Dr. Seiferts research group at the IFZ (Cancer Reseach) exists since 2014 and combines B cell immunology with lymphoma pathogenesis. Dr. Seiferts research aims at decoding the B cell system in healthy people and to determine the critical alterations in risk groups, such as infants and elderly or patients suffering from infections or tumors. This research unravels the B cell immune dynamics throughout life and clarifies which B cell subsets or antibody specificities are beneficial in health and limited in patients. Dr. Seiferts cancer research focusses on Chronic Lymphocytic Leukemia, Burkitt-Lymphoma and rare entities, such as Hairy Cell Leukemia and Splenic Marginal Zone Lymphoma. Dr. Seifert habilitated in 2017 at the Biological Faculty of the University of Duisburg-Essen in the subjects immunology and cancer research.