Blair R. Leavitt, MD, CM, FRCP(C), delivered a presentation titled "What can we do to determine the actual prevalence of HD?" at the 2013 World Congress on Huntington's Disease, Rio de Janeiro, Brazil, September 15, 2013. Dr. Leavitt is a senior scientist at the Centre for Molecular Medicine and Therapeutics and a Professor in the Department of Medical Genetics & the Department of Medicine, Division of Neurology (Associate), at the University of British Columbia (UBC), Vancouver, BC, Canada. He also directs the Transgenic Core Facility. He is director of research and a neurologist at the Centre for Huntington Disease. Dr. Leavitt completed his medical training at McGill University and medical internship at Columbia-Presbyterian Hospital. He finished his clinical training in neurology at Cornell University and Harvard Medical School. During his four years at Harvard Medical School, he also completed a research fellowship investigating neural stem cell transplantation as a potential treatment for neurodegenerative diseases. A laboratory scientist as well as practicing physician, Dr. Leavitt’s laboratory and clinical research is dedicated to developing new treatments for genetic diseases of the brain such as Huntington‘s disease. Dr. Leavitt is the co-director of the UBC Neurogenetics Clinic, director of research at the UBC Centre for Huntington’s disease and an editor-in-chief of the Journal of Huntington’s Disease.