From 1974 to 1985, Muhammad Said Al-Attar was Executive Secretary of the United Nations Economic Commission for Western Asia (currently ESCWA).
In 1962, Muhammad Said Al-Attar joined the Republican revolutionary movement in Northern Yemen and supported the “26 September revolution” against the Imamat .
In November 1962, he was appointed as the first Director General of the Yemen Bank for Reconstruction and Development and a member of the Supreme Council for Economic Affairs.
Between 1968 and 1971, Al-Attar was the Permanent Representative of the Arab Republic of Yemen at the United Nations in New York; he was appointed to this position again in 1973.
Muhammad Said Al-Attar received the Legion of Honour (Ordre National de la Légion d'honneur, highest French order of merit).