Stephen Honeybul is a Consultant Neurosurgeon with a subspecialty interest in neurovascular surgery and a research interest in clinical outcomes and ethics. Currently he is the state-wide Director of Neurosurgery in Western Australia and a Consultant Neurosurgeon at Sir Charles Gairdner Hospital, Royal Perth Hospital and Fiona Stanley Hospital. A fellow of the Royal College of Surgeons of England and Australasia, past member of the Neurosurgical Board of Australia and currently an examiner for the final neurosurgical fellowship examination, he is also the current chair of the WFNS ethics and law committee. Angelos Kolias is a Consultant Neurosurgeon and Senior Clinical Lecturer at the Department of Clinical Neurosciences, Addenbrooke’s Hospital and the University of Cambridge, Cambridge, UK. His interests include neurotrauma, neuroendoscopy, anterior skull base/pituitary surgery and spine surgery. He is also interested in the methodology of clinical neurosurgical research (particularly trials) and global neurosurgery. He is the Co-Chief Investigator of four NIHR-funded randomised trials in the field of neurotrauma and the Associate Director of the NIHR Global Health Research Group on Neurotrauma.