Dr Challiner trained in Medicine at St Georges Hospital, University of London. He underwent general training in Paediatrics, Emergency Medicine and Trauma Surgery before proceeding to higher training in Anaesthesia and Intensive Care Medicine as a Registrar based at The Queen Elizabeth Hospital & Trauma Unit in Birmingham and Senior Registrar based at St Thomas’ and Royal Brompton Hospitals in London.

Dr Challiner was appointed as a consultant to the Trust in 1998. He was ICU Director from 2000-2008 and Clinical Director from 2005-2011. He is currently Secondary Care Clinician for the governing body of Canterbury and Coastal CCG.