Principal Research Fellow at Dementia Research Centre, University College London. Keir is a neuropsychologist leading the posterior cortical atrophy study. He is also Vice Chair of the ISTAART Atypical AD PIA. His research investigates how visual perception, spatial orientation and coordinated movements may be altered in dementia, and what this means for diagnosis, management and understanding of disease heterogeneity. He recently developed a test to detect cortical visual loss (‘brainsight’, not eyesight loss) in the UK Biobank study.