Gregory S Day, MD MSc FRCPC


  • 2006, Masters of Science (Physiology/Neuroscience): Queen’s University, Kingston, Ontario, Canada

  • 2009, Medical Doctorate: Queen’s University, Kingston, Ontario, Canada

  • 2014, Postgraduate Medical Education (Residency), Adult Neurology: University of Toronto, Toronto, Ontario, Canada

  • 2015, Postdoctoral Fellowship (Memory and Aging): Washington University in St. Louis, St. Louis, MO

Board Certifications

  • Fellow of the Royal College of Physicians and Surgeons of Canada (board certification in Neurology)


  • John Wherrett Award for Outstanding Neurology Resident Research, University of Toronto (2013)

  • Future Leader in Dementia Award, Pfizer Canada (2013)

  • André Barbeau Memorial Prize for Basic Science Research, Canadian Neurological Society (2014)

  • J.T. Marotta Teaching Award, University of Toronto, Department of Medicine (2014)

  • Eugene M Johnson, Jr. Weston Brain Institute Postdoctoral Fellowship, Weston Brain Institute (2015)

  • Distinguished Reviewer of the Year, Canadian Journal of Neurological Sciences (2015)

  • American Brain Foundation, Clinical Research Training Fellowship (2016)

Clinical Interests

I maintain special clinical interest in the diagnosis and management of patients with rapidly progressive dementia (including Creutzfeldt-Jakob disease), and autoimmune-mediated encephalitis (including patients with NMDA-receptor encephalitis and similar diseases).

Research Interests

My research strives to integrate clinical (e.g., symptoms and signs) and paraclinical measures (e.g., structural/functional/PET neuroimaging, cerebrospinal fluid biomarkers) to inform the pathophysiology of neurodegenerative and autoimmune causes of dementia, while improving diagnostic accuracy, access to disease-modifying therapies, and patient outcomes.