Question: Who wrote  a book about Muhammad Ali and boxers who opposed him?
Sentence (from "Facing Ali (book)"): The profiled fighters include Ali's famous opponents like George Foreman, Joe Frazier, and Ken Norton; and also the relatively obscure like the German butcher Jurgen Blin who "was back at work at the sausage factory" after having fought with Ali the previous day.
Relevant evidence: No