I am a Professor of Paediatric Endocrinology based at the UCL Great Ormond Street Institute of Child Health in London. I am based within the Molecular Basis of Rare Diseases Section within the Genetics and Genomic Medicine Programme. I led the Endocrinology Department at Great Ormond Street Hospital for Children between 2006 and 2023, and practice as a consultant paediatric and adolescent endocrinologist based at GOSH and UCL Hospitals. In 2012, I was listed in the Times Top 100 Paediatric Specialists in the UK.