William Arthur Moore was born on December 21, 1880, in Glenavy, Antrim, Ireland.

He was a traveller, journalist, and author. He was educated at Campbell College, Belfast, and St. John's College, Oxford, where he was elected as president of the Oxford Union. In 1904, Moore was employed as secretary to the Balkan Committee established to publicize the plight of Macedonian Christians. He travelled extensively in the Balkans, and in 1908, he reported on the Young Turk revolution for several British newspapers. In 1909, after reporting on the civil war in Persia, he became the official correspondent of The Times in Teheran. In 1913, he reported from St. Petersburg, Russia. Moore travelled to Albania in 1914 to report on events following its declaration of independence. He enlisted in 1915 and spent much of the First World War working in Salonica. He was awarded a military Member of the Order of the British Empire. He continued as a Middle Eastern correspondent for The Times from 1919 to 1921. He edited the New Age (1922-1923), served as a Bengal European constituency member in the Indian legislative assembly (1927-1933) and was a managing editor of the Statesman, the British newspaper in India (1932-1942). In 1948, he founded an intellectual journal in India entitled Thought (1948–1955). Moore returned to England in 1952 a spent the rest of his life writing.

In 1915, he married Maud Eileen Maillet (-1957). He died on July 23, 1962, in London, England.