1999-2002: Clinical Research Fellow, Stroke Research Group, UCL Queen Square Institute of Neurology (ION), London, UK
2002-2004: SpR in Neurology, Department of Neurology, The Royal Free Hospital / National Hospital for Neurology and Neurosurgery / ION, London, UK
2004-2005: Clinical Senior Lecturer / Honorary Consultant Neurologist, Royal Free Campus, ION / Royal Free and Chase Farm Hospitals, 听London, UK
Nov-Dec 2005: Acute Stroke Thrombolysis Fellowship, Calgary Stroke Program, Canada
2006 to date: Honorary Senior Lecturer in Clinical Neurosciences, Royal Free Campus, ION, London, UK
2006 to date: Consultant Neurologist, Dept. of Neurology, TUH 2007-2011: Clinical Senior Lecturer in Neurology, School of Medicine, Trinity College Dublin (TCD)
2011-2020: Clinical Associate Professor in Neurology, Academic Unit of Neurology, School of Medicine, TCD
2020 to date: Clinical Professor in Neurology, Academic Unit of Neurology, School of Medicine, TCD