Organizations Home>Mental_Health>Disorders>Dissociative>Multiple_Personality>Organizations     Web Pages Trauma Help Home Page Site of the SEMISSD (Southeastern Michigan Society for the Study of Dissociation), a meeting place for education and consultation. The International Society for the Study of Dissociation Designed for mental health professionals, this organization is devoted to research, training, and treatment of dissociative disorders. New York Society for the Study of Multiple Personality and Dissociation A study group that brings together both professionals and laypersons in a safe environment and offers support, dialogue and the latest treatment techniques. New England Society for the Treatment of Trauma and Dissociation The NESTTD is an affiliate society of the International Society for the Study of Dissociation (ISSD) that was founded in 1984 and has been incorporated as a nonprofit organization.