In May 1944, he joined a group that published a "Design for the Charter of the General International Organization" to succeed the ruined League of Nations. The United States, Britain, the Soviet Union, and China all issued proposals after the Dumbarton Oaks Conference in October 1944 of that year that closely paralleled those of the "Shotwell Commission". He organized an educational campaign to support the United Nations. He attended the first UN meeting in San Francisco in April 1945 (where Alger Hiss was serving as acting secretary general) as a consultant representing Carnegie, then elected by 42 U.S. consultants there to lead their delegation. He helped draft the Charter of the United Nations as a private consultant to the U.S. State Department.