In 1995 he participated in a study on the psychiatric effects of the detention and torture of
Palestinian political prisoners. He has been involved with various studies on the effects of war and atrocity, and of displacement and asylum-seeking in
Nicaragua,
Guatemala,
Bosnia and the UK. He has published extensively on the effects of
torture as well as the effects of war-related violence on women and children. He drew international attention with a series of publications questioning the existence of
post-traumatic stress disorder, criticizing the
medicalization of psychotherapy for trauma and the exaggeration of mental illness statistics. Recently he has argued that global
mental health statistics should take into account differing
ethnopsychiatric definitions. == Palestinian controversy ==