John Berger is a storyteller, essayist, novelist, screenwriter, dramatist and critic. He is said to be one of the most internationally influential writers of the last fifty years. I can defiantly see why Scott Russell Sanders picked him to reference. He's taken part in many things like exploring relationships between individuals and society, culture and politics, novels, book works, essays, plays, films, photographic collaborations and performances. Sanders picked a very good choice to reference because it seems like John Berger has the entire package when it comes to literature.
http://www.johnberger.org