I am a Professor of Paediatric Endocrinology based at the UCL Great Ormond Street Institute of Child Health in London. I am Head of the Section of Genetics and Epigenetics in Health and Disease within the Genetics and Genomic Medicine Programme. I am also Head of Clinical Service in Endocrinology at Great Ormond Street Hospital for Children 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.