He wasn't just important for his bold theory, however. The University of Arizona sums up his life simply, and elegantly:
Paul's work bridged ecology, anthropology and paleontology is a way that had never been done before. He added deep time to ecological thinking, put prehistoric humans alongside now-extinct animals, and gave paleontology an environmental relevance it hadn't previously had. Paul was always a good friend and will always be my favorite paleontologist.He will be missed.