 By this time, Boder spoke over seven languages, allowing him to conduct interviews in the subjects' native tongue.Most of the subjects were Eastern European Jews, primarily from Poland, but Boder also spoke with Western European Jews, non-observant German Jews, Greek Jews and non-Jews.In October 1946, Boder returned to the U.S. and began transcribing the interviews and working on a book manuscript, supported by a grant from the National Institute of Mental Health.