Trevor Wittman

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Trevor Wittman (born March 5, 1974 in Denver, Colorado) is an American boxing and MMA trainer.[1][2]

Training career[edit]

Compelled to retire from boxing after being diagnosed with hyperinflated lung, Wittman transitioned to training boxers in the Denver metropolitan area.[3][4][5] He founded T's K.O. Fight Club in Wheat Ridge, Colorado in March 1998.[6] The business broadened its scope to include other combat sports such as mixed martial arts, eventually resulting in Wittman closing T's K.O. Fight Club[7] and establishing the Grudge Training Center facility[4] in Wheat Ridge in 2009. Grudge relocated to Arvada, Colorado in 2013. Having developed experience working with and making training equipment for fighters, in 2015 Wittman founded ONX Sports, a combat sports equipment company. To focus more attention on ONX Sports, Wittman closed down Grudge in November 2016, though he continues to train a few select fighters, including Rose Namajunas, Justin Gaethje, and Nate Marquardt.[8]

Personal life[edit]

Wittman wrestled at Berlin High School, after which he moved to New Jersey, then to Colorado, where he attended the Colorado Institute of Art. Wittman married wife Christina in 2005, and has a son Terrence and a daughter Marissa.[3][4][5]

Notable MMA fighters trained[edit]

Boxers trained[edit]


  1. ^ Mulei, Alessandro (2009-08-26). "T's KO Fight Club". Five Knuckles. Retrieved 2010-06-26. 
  2. ^ Luevanos, Fernando (2008-10-28). "Grudge Training Center". Sherdog. Retrieved 2010-06-26. 
  3. ^ a b Carroll, Nick (21 October 2010). "Famed trainer credits teacher with putting him on the right path". The Berlin Citizen. 14 (42). Berlin, Connecticut. p. 1, 31. 
  4. ^ a b c Zandstra, Tate (8 March 2012). "Mixing up martial arts". Boulder Weekly. Boulder, Colorado. p. 48. Retrieved 3 May 2017. 
  5. ^ a b Chambers, Mike (15 October 2005). "You oughta know: Boxer/trainer Trevor Wittman". The Denver Post. Denver. Retrieved 3 May 2017. 
  6. ^ "Home". T's K.O. Fight Club. Archived from the original on 17 August 2009. Retrieved 3 May 2017. 
  7. ^ "Home". T's K.O. Fight Club. Archived from the original on 3 November 2009. Retrieved 3 May 2017. 
  8. ^ Garcia, Raphael; Humes, Schwan (5 May 2017). MMA Ratings Podcast: 5.4.2017 (Podcast). MMA Ratings Podcast. Event occurs at 24:28. Retrieved 5 May 2017. 
  9. ^

External links[edit]