Arnett has spent the majority of his career at the
University of Manitoba, Winnipeg from which he obtained a PhD in Clinical Psychology followed by a Fellowship in Clinical Neuropsychology at Institute of Living,
Hartford, Connecticut. He returned to Canada and in 1985 was appointed Head of the Department of Clinical Health Psychology at the University of Manitoba. This department was designed to expand the remit of psychologists in healthcare beyond mental health into physical health. Arnett's publications focus on arguing for the need for clinical psychologists to have a wider remit within healthcare. ==Publications==