Dr Calder has been a consultant paediatric radiologist at Great Ormond Street Hospital for 19 years. He has special interests in rare bone disorders and paediatric thoracic imaging.In the field of respiratory imaging he has contributed to the London CF Collaboration, the ChildEU project, the EU COST action on interstitial lung disease in children and the European Medicines Agency. He provides radiology input to the respiratory, tracheal and thoracic multidisciplinary team meetings on a weekly basis at Great Ormond Street. Outside of radiology his interests include Mahler, pastel painting and both real and videogame golf.