Dr Mark Rawle is a consultant geriatrician at Whipps Cross University Hospital, and research lead for Older Person's Services in Barts Health. He is a PhD fellow at the MRC Unit for Lifelong Health and Ageing at UCL. His research focuses on the epidemiology of polypharmacy in older populations and longitudinal medication use. He has specific interest in the impact of medication use on later life cognition (including incident dementia).