Xavier Bossuyt gained his medical qualification at the Catholic University of Leuven, Belgium. He was trained in clinical pathology and clinical laboratory immunology at the University Hospitals Leu¬ven and at the National Institutes of Health, Bethesda, USA. He is a clinical laboratory immunologist at the Department of Laboratory Medicine, University Hospitals Leuven and full professor at the KU Leuven. His current research is focused on primary immunodeficiencies and serologic markers in autoimmune diseases. He is an active member of EASI (European Autoimmunity Standardization Initiative), GEAI (Groupe d’Etude de l’Auto-Immunité) and the EFLM (European Federation of Laboratory Medicine) Task and Finish Group “Autoimmunity Testing".