Professor Langdon completed her training as a clinical psychologist at the University of Oxford and the Institute of Psychiatry, Psychology & Neuroscience, London, UK. She worked as a clinical neuropsychologist at the National Hospital for Neurology and Neurosurgery, Queen Square, London, for 16 years, obtaining a PhD on reasoning in organic brain syndromes from the University of London Queen Square Institute of Neurology. Professor Langdon is registered as both a neuropsychologist and a health psychologist and is now Professor of Neuropsychology and Director of Health and Medicine at Royal Holloway, University of London.

Professor Langdon is an honorary professor at the Preventative Neurology Unit within the Queen Mary University of London, and a Fellow of the British Psychological Society (BPS). As the neuropsychology lead on a number of multinational trials for the pharmaceutical industry, she has worked extensively on the psychological aspects of MS, including measurement of cognition and its relation to pathology and other disease variables. Professor Langdon is Co-Chair of the Brief International Cognitive Assessment for MS (BICAMS), which has developed a cognitive assessment in MS that is in use in 30 countries (www.BICAMS.net). She is a frequent contributor to international scientific meetings and committees and is a Trustee of the MS Trust, with whom she has authored the MS cognition website www.stayingsmart.org.uk.