When did joseph campbell create the hero's journey?
No context provided
When did joseph campbell start creating the hero's journey by exploring mythology?
1934 in his Sarah Lawrence classes
The study of hero myth narratives started in 1871 with anthropologist Edward Burnett Tylor's observations of common patterns in plots of heroes' journeys. Later on, others introduced various theories on hero myth narratives such as Otto Rank and his Freudian psychoanalytic approach to myth, Lord Raglan's unification of myth and rituals, and eventually hero myth pattern studies were popularized by Joseph Campbell, who was influenced by Carl Jung's view of myth. In his 1949 work "The Hero with a Thousand Faces", Campbell described the basic narrative pattern as follows:
When did joseph campbell publish his book on the hero's journey?
1949
Hero's journey
Hero's journey
https://en.wikipedia.org/wiki/Hero%27s%20journey
In narratology and comparative mythology, the hero's journey, or the monomyth, is the common template of stories that involve a hero who goes on an adventure, is victorious in a decisive crisis, and comes home changed or transformed.
Hero's journey
Joseph John Campbell (March 26, 1904 – October 30, 1987) was an American professor of literature at Sarah Lawrence College who worked in comparative mythology and comparative religion. 
Joseph Campbell
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.
Joseph Campbell
In narratology and comparative mythology, the hero's journey, or the monomyth, is the common template of stories that involve a hero who goes on an adventure, is victorious in a decisive crisis, and comes home changed or transformed. Joseph Campbell, an American professor of literature at Sarah Lawrence College, began exploring mythology and creating the hero's journey in 1934. He published his book, "The Hero with a Thousand Faces", in 1949, in which he discusses his theory of the journey of the archetypal hero shared by world mythologies.