Joseph Campbell (15 July 1879 – 6 June 1944) was an Irish poet and lyricist. He wrote under the Gaelic form of his name Seosamh Mac Cathmhaoil (also Seosamh MacCathmhaoil) Campbell being a common anglicization of the old Irish name MacCathmhaoil. He is now remembered best for words he supplied to traditional airs, such as My Lagan Love and Gartan Mother's Lullaby; his verse was also set to music by Arnold Bax and Ivor Gurney. Wikipedia
Joseph John Campbell (March 26, 1904 – October 30, 1987) was an American writer. He was a professor of literature at Sarah Lawrence College who worked in comparative mythology and comparative religion. His work covers many aspects of the human experience. Campbell's best-known work is his book The Hero with a Thousand Faces (1949), in which he discusses his theory of the journey of the archetypal hero shared by world mythologies, termed the monomyth. Wikipedia