Clay Matthews III (born 1986), current linebacker for the Green Bay Packers, son of former
William III of England | George III of the United Kingdom | Henry III of England | George III | Edward III of England | Henry III | Henry Clay | Edward III | Charles III of Spain | William III | Stanley Matthews | Loudon Wainwright III | clay | WTA Tier III tournaments | Richard III of England | Benigno Aquino III | Pope Alexander III | Star Wars Episode III: Revenge of the Sith | Henry III of France | Gustav III of Sweden | Dave Matthews | Shalmaneser III | Alexander III of Russia | Albatros D.III | Frederick III | Rainier III, Prince of Monaco | Otto III | Henry Clay Frick | Frederick William III of Prussia | Victor Emmanuel III of Italy |
Attending the player evaluations of the by-invitation-only 2009 NFL Scouting Combine were all four of Norton's Trojan senior class linebacker protégés: Brian Cushing, Kaluka Maiava, Clay Matthews III, and Rey Maualuga.
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From 2004-2009, he served as the linebacker coach for the Trojans; while at USC he helped recruit and develop NFL-bound linebackers such as NFL Pro Bowler Lofa Tatupu, Dallas Sartz, Keith Rivers, Brian Cushing, Kaluka Maiava, Clay Matthews III, and Rey Maualuga.