 In 1971, Zaslow surrendered his California psychology license following an injury to a patient during rage-reduction therapy.Zaslow's ideas on the use of the Z-process and holding for autism have been dispelled by research on the
genetic/biologic causes of autism.Zaslow and his "Z-process", a physically rough version of holding therapy, influenced Foster Cline (known as the "father of attachment therapy") and associates at his clinic in Evergreen A key tenet of Zaslow's approach was the notion of "breaking through" a child's defenses—based on the model of ego defenses borrowed from psychoanalytic theory, which critics state has been misapplied.