Question: Who co-authored a 2003 biography of Muhammad Ali along with Don Atyeo, in which chapter on Ali's fight with a two-time world heavyweight champion and an Olympic gold medalist has been described as "an absolute classic"?
Sentence (from "Tim Witherspoon"): Upon winning his second world title, Witherspoon joined Floyd Patterson and Muhammad Ali as the only boxers to win multiple world heavyweight championships.
Relevant evidence: No