John Duncan is a Consultant Neurologist specialising in epilepsy, practicing at the National Hospital for Neurology and Neurosurgery, Queen Square, London and at Epilepsy Society in Chalfont St Peter, UK, He was appointed Professor of Neurology at the UCL Institute of Neurology in 1998. From 2012 to 2018 he was Clinical Director of the National Hospital for Neurology and Neurosurgery. In 2004 he received the annual Clinical Research recognition award of the American Epilepsy Society. He is past-President of the UK chapter of ILAE.
In 2005 he was elected Ambassador for Epilepsy and to be a Fellow of the Academy of Medical Sciences.