Mr Nicholls is a Consultant Paediatric Surgeon, and Chairman of the Children’s Surgery Group at St George’s Hospital, London. He is also a Honorary Senior Lecturer with The St George’s Hospital Medical School, University of London. He teach's undergraduate and postgraduate medical students on a weekly basis and performs selection interviews, examine and lecture medical students several times each year.
As an examiner for the Royal College of Surgeons, Mr Nicholls represents the British Association of Paediatric Surgeons on the Intercollegiate Board of Examiners. He is a Senior Journal Article Reviewer with the Journal of Paediatric Surgery, and a visiting lecturer at Imperial College London. As a general paediatric surgeon, he has a special interest in neonatal, and gastro-intestinal surgery, as well as inguinoscrotal surgery and provides vascular access for children requiring long term parenteral nutrition, or chemotherapy.
He performs appendicectomies, cholecystectomies and fundoplications laparoscopically when appropriate, many Percutaneous Endoscopic Gastrostomies for assisted nutrition. The more common neonatal conditions he manages include Hirschsprung’s disease, malrotation, atresias of the oesophagus, and intestine, and necrotizing enterocolitis.