Professor of Neurology, University of Washington

New York Medical College

University of Ottawa, Ottawa Hospital Research Institute

University of Bern and University of Oxford

Neurosurgery, Johns Hopkins, Columbia University

Yale University School of Medicine

Vascular Neurologist, Massachusetts General Hospital, Harvard Medical School

Faculdade de Medicina de Ribeirão Preto - Universidade de São Paulo

Professor and Vice Chair, Dept of Neurology ,Wake Forest School of Medicine

Professor of Anesthesiology, Neurology & Neurosurgery, Duke University