Hashem was born in Nablus and educated in Istanbul. In 1915 he joined the army and then the Arab government in Damascus. He taught law at Damascus University and was appointed by Faisal I of Iraq to the Court of Appeal. In 1920 he moved to Jordan following the French occupation of Syria.
In 1933 he became Prime Minister, Minister of Justice and head of the Supreme Court of Trans-Jordan. Other offices include: