He has been elected an honorary Fellow of eleven national Colleges or Academies, in the UK, Ireland, Hong Kong and Australia.
Professor Stephenson was formerly Dean of the Medical School and Professor of Child Health at the University of Nottingham and a non-executive Director of Nottingham University Hospitals NHS Trust.
He is an honorary consultant in paediatrics at UCL Hospital and Great Ormond Street Hospital London and has co-authored seven textbooks. He studied computing and physiological science before medicine. His research has mainly been in physiology of early life and acute and chronic paediatric illness. Professor Stephenson has published over 330 peer reviewed papers, commentaries and book chapters. As a researcher he has received over £15 million in funding through 50 competitively awarded grants.