Professor for Dermatology and Allergy; Director of Research at the Department of Dermatology and Allergy; Associate Director of the Allergie-Centrum-Charité; Head of the Specialty Clinics for Urticaria, Mastocytosis, Pruritus and Angioedema and the Dermatological Allergology Lab; trained in experimental pathology at the Beth Israel Deaconess Hospital und Harvard Medical School in Boston (1995-98); Board certification for Dermatology (2000) and Allergology (2003). Habilitation („Why do we have mast cells?“) at the University of Mainz (2003). Head of urticaria network e.V. (UNEV). Coordinator of the National Priority Programme “Physiological functions of mast cells”. Head of GA²LEN Taskforce on urticaria and the EU COST programme “Mast cells and basophils”. Board member for ECARF in German Foundation for Pollen Information Service. Authored more than 325 articles in books and peer-reviewed journals.