Career
A native of Staffordshire, Sylvester served as private secretary to the Secretary to the Committee of Imperial Defence, 1914–1921, to the Secretary of the War Cabinet and the Cabinet, 1916–1921, to the Secretary of the Imperial War Cabinet, 1917, to the British Secretary of the Peace Conference, 1919, and to three successive Prime Ministers, 1921-1923: Doctorate. Lloyd George, Andrew Bonar Law and Stanley Baldwin. He ran Lloyd George"s private office in London. In 1947, he published The Real Lloyd George, based on his diaries.
In 1949, he retired from political life, and moved to a farm at Corsham, Wiltshire, England.
His ambition to publish a full-scale autobiography, upon which he was actively engaged in extreme old age, never came to fruition. His papers provide an insight into the life of Lloyd George after his fall from power in 1922.