Philip Paul Bliss (9 July 1838 – 29 December 1876) was an American composer, conductor, and hymn writer. He wrote many well-known hymns, including "Hold the Fort" (1870), "Almost Persuaded" (1871); "Hallelujah, What a Saviour!" (1875); "Let the Lower Lights Be Burning"; "Wonderful Words of Life" (1875); and the tune for Horatio Spafford's "It Is Well with My Soul" (1876).

https://en.wikipedia.org/wiki/Philip_Bliss