Roger Barker, BA, MBBS, MRCP, PhD, is professor of clinical neuroscience at the University of Cambridge and a consultant neurologist at the Addenbrooke’s Hospital. He is a principal investigator in the Cambridge Stem Cell Institute. He is the lead academic scientist of Cambridge Drug Discovery Institute and John van Geest Centre for Brain Repair and the chair of neurodegeneration at LifeArc. He became a Fellow of the Academy of Medical Sciences in 2015 and president of the World Parkinson Coalition in 2023. His research seeks to better characterize the clinical heterogeneity of Parkinson’s disease (PD) and determine its molecular basis. This work has helped him define the best way by which to take new therapies into the clinic, including novel gene and cell-based therapies for people with PD. He has planned and undertaken several experimental clinical trials, including a neural transplant trial in PD (TRANSEURO and new STEM-PD trial).