Hashim al-Atassi
Al-Kayyali also served as a diplomat for Syria. After the formal independence of Syria following the Franco-Syrian Treaty of Independence in September 1936, he was appointed non-resident ambassador to the League of Nations by president Hashim al-Atassi, a position he quit after his nomination as a cabinet member in December 1936. From 1947 to 1949 he represented the Syrian Republic as a delegate to the United Nations General Assembly.