in 1909, Jung traveled with Freud and the Hungarian psychoanalyst Sándor Ferenczi to the United States; they took part in a conference at Clark University in Worcester , Massachusetts . The conference at Clark University was planned by the psychologist G. Stanley Hall and included twenty-seven distinguished psychiatrists, neurologists and psychologists. It represented a watershed in the acceptance of psychoanalysis in North America. This forged welcome links between Jung and influential Americans.  Jung returned to the United States the next year for a brief visit.