His research and clinical work focuses on people with multiple sclerosis, traumatic brain injury and Conversion Disorder.
He has undertaken a number of studies investigating how front-line journalists are affected by their work covering war and man-made and natural disasters.
After obtaining his PhD, he worked as a Senior Registrar at the Maudsley Hospital in London before taking up an appointment at the University of Toronto where he is currently a professor of psychiatry and a clinician scientist at the Sunnybrook Research Institute.
[citation needed] Over a three decade period, Feinstein's work has focused on determining brain imaging correlates of depression and pseudobulbar affect in people with MS.
[citation needed] In 2000 Feinstein obtained a grant from the Freedom Forum in Washington, D.C. to undertake the first study exploring how war can affect the psychological wellbeing of front-line journalists.