There was a Biblical person named Job who is reflected in prologue and perhaps epilogue. This man had a spiritual reputation for righteousness and perhaps patience as reflected in Ezekiel and James.
However many bible scholars believe that the author of the book of Job composed the dialogs to show the different positions utilizing Israel to explain suffering. The final dialog between God and Job reflects the way I believe a person of faith; his encounter with God would move past logical explanation of suffering (wife vs. Job). The production is not about Job's history or any man's journey but about our Christian journey and the way we relate to God.