Professor Cornelius Katona trained in general and old age psychiatry at Fulbourn Hospital, Cambridge and St George's Hospital Medical School, London. He was Senior Lecturer in psychiatry of the elderly at University College London from 1986 till 1991 when he was appointed Foundation Professor of psychiatry of the elderly. Between 1998 and 2003 he served as Dean of the Royal College of Psychiatrists.
He is currently Hon Professor of Psychiatry of the Elderly at University College London and works as a Consultant Psychiatrist in the NHS in the Kent and Medway Mental Health Partnership Trust. His expertise is in old age psychiatry (including the assessment of capacity) and in mood disorders. He has extensive expert witness experience in assessing psychiatric consequences of medical negligence and in preparing reports on the mental health of asylum seekers and refugees.