Who is Geoff from Mutant Message Down Under and what is their importance?

Geoff is a middle-aged, white man the author encounters during her pre-walkabout stay in Australia. He is white, educated, intelligent, and attractive. In narrative terms, he functions as a representation and/or embodiment of non-Aborigine Australians, giving voice to the perception that Aborigines are lazy, selfish, unmotivated, and unworthy of the kind of assistance Marlo wants to give them.