 Cohen also assisted in the drafting of the 1944 Dumbarton Oaks agreements leading to the establishment of the United Nations.In 1945 Cohen served as the United States' chief draftsman at the Potsdam Conference.In 1942, "The New York Times" published a letter by Cohen and co-author Erwin Griswold decrying the United States Supreme Court's "Betts v. Brady" ruling that poor criminal defendants had no right to an attorney.