William Young Fullerton (8 March 1857 – 17 August 1932) was a Baptist evangelist, administrator and writer.
As a young man, he was influenced by the preaching of Charles Spurgeon, who became his friend and mentor.
His published works include biographies of John Bunyan, Charles Spurgeon, James William Condell Fegan and Frederick Brotherton Meyer; missionary histories and devotional writings.
He is remembered for his hymn entitled "I Cannot tell why He, whom angels worship", which he set to the traditional Irish melody "Londonderry Air".
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