Born near Appin, Upper Canada, McArthur attended the University of Toronto and worked briefly for the Toronto Mail before moving to New York in 1890. In 1896 he became editor of Truth and as such encouraged both Canadian and American writers. Returning to his birthplace in 1908 he combined farming with journalism, contributing many articles, essays and poems to the press. Several compilations of his work were published, the best known of which is a collection of essays entitled In Pastures Green. He died in London, Ontario.