Who was marlow?where was he working?

Marlow is the protagonist and main narrator of the story, he stumbles into Africa looking to sail a steamboat and finds much more. He possesses a strong interest in the past. He also has a good work ethic; he views working hard as a means of achieving sanity. In many respects, the worldview of Marlow is that of a typical European. Still, he is intended to be a versatile character, one of the few who does not belong to a distinct class, and he thus can relate to different kinds of people with more ease than his peers. His trip is up the Congo River.