What are the two worlds of the Hero's Journey?

What author is most associated with the concept of the Hero's Journey?

The future hero is first given notice that his or her life is going to change.

The future hero often refuses to accept the call to adventure. The refusal may stem from a sense of duty, an obligation, a fear, or insecurity.

The hero begins the adventure, leaving the known limits of his or her world to venture into an unknown and dangerous realm where the rules and limits are unknown.

The hero experiences and is transformed by a series of tests, tasks, or challenges. The hero usually fails one or more of these tests, which often occur in threes.

The destination of the quest is achieved, though the hero still may have a fight or struggle in front of them.

The hero may refuse or struggle to return to achieve the final goal, either because the hero doubts themself or the odds look too long.

At this final point in the adventure, the hero must retain the wisdom gained on the quest, integrate that wisdom into their previous life, and return home.