David Millar Clark CBE FBA FMedSci (born 20 August 1954) is a British psychologist. He has been a Professor of Psychology at the University of Oxford since 2011 and is also National Clinical Adviser at the Department of Health.Clark was appointed Commander of the Order of the British Empire (CBE) in the 2013 New Year Honours for services to mental health.He is married to the psychologist Anke Ehlers.