Facing Ali is a 2002 book authored by Stephen Brunt; it is about fifteen different fighters from around the world who battled with Muhammad Ali in boxing fights.
 In each chapter of the book, one of the selected fighters recalls the experience of fighting with Ali.
 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.
 Other fighters profiled in the book include Tunney Hunsaker, Jean Pierre Coopman, Henry Cooper, Ron Lyle, Chuck Wepner, George Chuvalo and Larry Holmes.
William James Wilde (15 May 1892 – 10 March 1969) was a British professional boxer and world boxing champion from Wales.
 Often regarded as the greatest British fighter of all time, he was the first official World Flyweight Champion and was rated by American boxing writer Nat Fleischer, as well as many other professionals and fans including former boxer, trainer, manager and promoter, Charley 'Broadway' Rose, as "the Greatest Flyweight Boxer Ever."
 Wilde earned various nicknames such as, "The Mighty Atom," "Ghost with the Hammer in His Hand" and "The Tylorstown Terror" due to his bludgeoning punching power.
 While reigning as the world's greatest flyweight, Wilde would take on Bantamweights and even Featherweights, and knock them out.
 As well as his professional career, Wilde participated in 151 bouts judged as 'newspaper decisions', of these he boxed 70 rounds, won 7 and lost 1, with 143 being declared as 'no decisions'.
 Wilde has the longest recorded unbeaten streak in boxing history, having gone 104-0.
Pete McCormack (born January 27, 1965) is a Canadian author, filmmaker, screenwriter and musician.
 He is best known for directing the Academy Award short-listed documentary Facing Ali and the Leacock Award-nominated novel Understanding Ken.
 He is the creator of the HBO Canada documentary television series "Sports on Fire".
Derik Murray is the founder of Network Entertainment.
 He began his career as an advertising photographer and television commercial director before switching his attention to television, film and publishing projects.
 His credits include producing the Academy Award shortlisted "Facing Ali", a feature documentary made with Lionsgate Entertainment, and "I Am Bruce Lee", which had its US television premiere on Spike TV where it garnered the highest ratings for a documentary in the network’s history.
 Derik also produced "I Am Steve McQueen", produced and co-directed "I Am Evel Knievel", "I Am Chris Farley" (which surpassed "I Am Bruce Lee" ratings for Spike TV), "Johnny Cash - American Rebel" for CMT, and "The Cowboy" for Discovery.
 Derik recently produced and directed the feature documentary "I Am JFK Jr." and is executive producing and co-directing the seven-part series "Facing" for National Geographic.
 In 2017 he produced the feature film "I Am Heath Ledger".
Archie Moore (born Archibald Lee Wright; December 13, 1916 – December 9, 1998) was an American professional boxer and the longest reigning World Light Heavyweight Champion of all time (December 1952 – May 1962).
 He had one of the longest professional careers in the history of the sport.
 Nicknamed "The Mongoose", and then "The Old Mongoose" in the latter half of his career, Moore holds the record for the most career knockouts (132) in boxing history.
 Moore was a highly strategical and defensive boxer, with a great chin and bludgeoning power, he ranks #4 on "The Ring"s list of "100 greatest punchers of all time".
 Moore is rated by prominent boxing website BoxRec as the 3rd greatest pound-for-pound boxer of all-time.
 Moore was also a trainer for a short time after retirement.
 He trained boxers such as Muhammad Ali, George Foreman and James Tillis.
Facing Ali is a 2009 documentary directed by Pete McCormack about Muhammad Ali (born Cassius Marcellus Clay, Jr. in Louisville, Kentucky) as told from the perspectives of some of the notable opponents he faced during his career: George Chuvalo, Sir Henry Cooper, George Foreman, "Smokin'" Joe Frazier, Larry Holmes (a former sparring partner of Ali), Ron Lyle, Ken Norton, Earnie Shavers, Leon Spinks and Ernie Terrell.
Vitali Klitschko (born 19 July 1971) and Wladimir Klitschko (born 25 March 1976), collectively known as the Klitschko brothers are Ukrainian heavyweight boxers.
 During their peak years from 2004 until 2015, the Klitschko brothers were considered the most dominant heavyweight champions of their era, and amongst the most successful champions in boxing history.
 After the retirement of boxing legend Lennox Lewis, the Klitschko brothers held all heavyweight boxing world titles.
 Known for their exceptionally large frames and robotic boxing styles, the Klitschko brothers developed a style that utilized their athleticism and using their reach to break down opponents.
Leon Spinks (born July 11, 1953) is an American former professional boxer who competed from 1977 to 1995.
 In only his eighth professional fight, he won the undisputed heavyweight championship in 1978 after defeating Muhammad Ali via split decision, in what was considered one of the biggest upsets in boxing history.
 Spinks was later stripped of the WBC title for facing Ali in an unapproved rematch seven months later, which he lost by unanimous decision.
Marion Wilson (born October 19, 1956) is an American heavyweight boxer.
 Marion, despite having faced some of the heavyweight elite of his generation, he is perhaps best known for never being knocked out or stopped.
 As a result, he is considered by many to have one of the best chins in boxing, and boxing writer James Slater included him on a list of boxing's best "chins" and Livefight.com ranked him as #8 in terms of best heavyweight chins ever.
George Louis Chuvalo, CM (born September 12, 1937) is a retired Canadian professional boxer who was a five-time Canadian heavyweight champion, and two-time world heavyweight title challenger.
 Chuvalo, who is considered by many to have one of the best chins in boxing history, was never knocked down in his amateur career or his 93-fight professional career and was ranked #4 on ESPN's greatest chin in boxing history list.
 Chuvalo lost to Hall of Fame heavyweights such as Floyd Patterson, Muhammad Ali, Joe Frazier and George Foreman, but was credited for his spirited performances.
 He did defeat top contenders such as Yvon Durelle, Doug Jones, Jerry Quarry and Cleveland Williams.
 He fought for the world title twice, losing a controversial decision to Ernie Terrell and another decision in his first fight with Ali.

Question: What fighter profiled in Facing Ali was considered to have one of the best chins in boxing history?
Answer: George Chuvalo