Born in Teheran in 1900, he graduated in law and political science at the Universities of Teheran and Paris and began his career in the Ministry of Foreign Affairs in 1918.
Between 1926 and 1929, he was Secretary to the Iranian Legations in Paris, Warsaw, and London. He represented his Government at the World Economic Conference in London in 1933, and at the League of Nations; from 1934 to 1938 he was Charge d'Affaires at Berne.
On his return to Iran, Mr. Entezarn was Director of the Political Department of the Ministry of Foreign Affairs. In 1942, he was appointed Grand Master of Ceremonies at the Imperial Palace, and the next year became Minister of Public Health. Subsequently, he held the positions of Minister of Posts and Telegraph, Minister of Communications, and, in 1944-45, Minister of Foreign Affairs.
Mr. Entezam represented his country at the San Francisco Conference in 1945 and at the first session of the General Assembly. He was a member of the United Nations Special Committee on Palestine in 1947. At the third session of the General Assembly, he was chairman of the Fourth (Trusteeship) Committee, and of the Special Committee on Methods and Procedures which the Assembly established at that session. At the fourth session, he served as chairman of the ad hoc Political Committee of the Assembly. He is also Ambassador Extraordinary and Minister Plenipotentiary of his country to the United States.