Alexandra F. Santos is a Senior Clinical Lecturer and MRC Clinician Scientist at King’s College London and an Honorary Consultant in Paediatric Allergy at Guy’s and St Thomas’ Hospital NHS Foundation Trust. Alexandra qualified in Medicine from the University of Coimbra and completed a PhD in Allergy and Immunology at King's College London, supervised by Professor Gideon Lack. The focuses of her thesis were diagnostic markers of clinical allergy versus sensitisation to peanut, including the basophil activation test, IgE and IgG4 testing.