Mark Aaron Bernstein, BSc, MD, FRCSC (Neurosurgery), MHSc (Bioethics), currently works as a scientist at the Toronto Western Hospital/University Health Network, Toronto, Ontario, Canada. He has been a staff member at Toronto Western Hospital and also Hillcrest Hospital, Toronto, for more than 25 years, and in 1996 was appointed Professor in the Department of Surgery at the University of Toronto. Dr. Bernstein has had a distinguished career that has included service on numerous committees of medical and scientific bodies and extensive research activity, including on ethical and social issues relating to neurosurgery. He has been Associate Director of the Arthur and Sonia Labatt Brain Tumour Research Centre since 1999. In 2006 Dr. Bernstein was invited to deliver the Theodore Kurze lecture to the American Association of Neurological Surgeons and in 2011 he was appointed as the inaugural Greg Wilkins-Barrick Chair in International Surgery at the University Health Network, Toronto. Dr. Bernstein serves on the editorial boards of Brain Tumor Pathology, Journal of Neuro-Oncology, Neurosurgery Quarterly, and National Review of Medicine. He is the author of more than 275 articles in peer-reviewed journals.