Saul Faust is Professor of Pediatric Immunology and Infectious Diseases at the University of Southampton in Southampton, England; Director of the National Institute for Health Research Southampton Clinical Research Facility; and Clinical Director of the NIHR Wessex Local Clinical Research Network. In the course of his research career, he has led and participated in numerous clinical trials aimed at understanding and improving the clinical management of paediatric infectious diseases, with a special interest in the development of new vaccines.