Sebastian L. Johnston graduated from the University of London in 1982. He is a Professor of Respiratory Medicine & Allergy and a Consultant Physician in Respiratory Medicine & Allergy. He is the Director of the Asthma UK Centre in Allergic Mechanisms of Asthma and the Asthma UK Clinical Professor. His clinical interests include the treatment of asthma, allergies, and general respiratory medicine. His expertise includes general respiratory medicine, asthma, COPD, allergy, food allergy, hay fever, urticaria, and sub-lingual allergen immunotherapy.