Authors: Mark Fainaru-Wada
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L. Roger Turner/Wisconsin-State Journal
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Dave Stock/ProLook Inc.
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Jonathan Daniel/ALLSPORT/Hulton Archive/Getty Images
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Courtesy Joe Maroon
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Courtesy Mark Lovell
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Brad Mangin Photography
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Andy Hayt/Sports Illustrated/Getty Images
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Associated Press
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USC News
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AP Photo/Ed Betz
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Courtesy Bennet Omalu
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AP Photo/Paul Sancya
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AP Photo/Edouard H. R. Gluck
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Mariela Lombard/
ZUMAPRESS.com
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Courtesy Ann McKee
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Brian Cahn/
ZUMAPRESS.com
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Courtesy ESPN’s
Outside the Lines
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Brad Mangin Photography