Sheila Simpson’s contributions to all aspects of paediatric resuscitation have been central to the development of the specialty. She was appointed as Resuscitation Officer to Great Ormond Street Hospital in the early 1990s after concluding a career in PICU nursing as lead nurse of her unit. She was immediately involved in planning for the first paediatric advanced life support course in the UK and has been central to the development of such courses ever since with major contributions to, initially the PALS and then the EPLS courses. She had the idea of introducing a paediatric version of the ILS course and led the development of the course manual and programme of this, the most popular paediatric resuscitation course in Europe. In addition, she has made significant contributions to guidelines, notably the paediatric BLS and choking algorithms and was one of the first to develop and promote early warning scoring systems for children.