He is Research Professor Emeritus at the Norwegian Centre for Violence and Traumatic Stress Studies, Professor Emeritus of Disaster Psychiatry at the Institute of Clinical Medicine at the University of Oslo[1][2] and a lieutenant-colonel and former chief psychiatrist of the Norwegian Armed Forces Medical Service.
Upon his return to Norway he joined the Division of Disaster Psychiatry, a joint unit of the University of Oslo Faculty of Medicine and the Norwegian Armed Forces medical service.
[4] When the Division of Disaster Psychiatry became part of the newly established Norwegian Centre for Violence and Traumatic Stress Studies he continued as a research director with that organization, while also maintaining his professorship at the University of Oslo.
His major research projects include survivors of large accidents and natural disasters, and the mental health of military veterans.
[5] Weisæth was originally put forward as a psychiatric expert in the trial of Anders Behring Breivik, but was ultimately not appointed, although he commented extensively on the case in the media.