Background
Marks was born in Culwulla House, Jamberoo, New South Wales and educated at Sydney Grammar School.
Marks was born in Culwulla House, Jamberoo, New South Wales and educated at Sydney Grammar School.
He was admitted as a solicitor in 1902. As a result of an inheritance in 1912, he was able to partly finance the building of his chambers, the twelve-storey Culwulla Chambers in Castlereagh Street, Sydney, the tallest building in central Sydney until after World World War World War II In World War I he joined the Royal Navy Volunteer Reserve and served as a lieutenant in the North Sea and English Channel, commanded a gunnery school in Wales and returned to Australia in 1918 to encourage military recruitment. Marks was elected as a Nationalist member for the seat of Wentworth in 1919.
He made a notorious speech predicting that Armageddon would be initiated in 1934 when the British navy collected the Jewish people to take them to a Palestine.
Billy Hughes made him honorary under-secretary "to assist the prime minister especially in the administration of the mandated territories and shipping" in December 1921 in order to head off pressure to appoint him Minister for the Navy, but Stanley Bruce abolished this position in 1923. He took a strong interest in foreign affairs, aviation and the film industry.
He was one of seven Nationalists, including Billy Hughes, who voted to bring down the Bruce government, forcing the 1929 election. He was defeated at the 1931 election by Eric Harrison, although both had United Australia Party endorsement.