From 1948 to 1967, Rosenne served as a Legal Adviser to the Foreign Ministry.[1][7][8][9] Among other things, he was as a member of the Israeli delegation to the 1949 Armistice Agreements. He was also a member of the UN-established International Law Commission from 1962 to 1971, and has been a member of the Institut de Droit International since 1963.