Trevor Wittman

Compelled to retire from boxing at 21 years old after being diagnosed with a hyperinflated lung, Wittman transitioned to training boxers in the Denver metropolitan area.^[4][5][6] He founded T's K.O. Fight Club in Wheat Ridge, Colorado in March 1998.^[7] 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^[8] and establishing the Grudge Training Center facility^[5] 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 Kamaru Usman.^[9]

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 his wife Christina in 2005, and has a son and a daughter.^[4][5][6]

In 2021, it was reported that Wittman was diagnosed with Dupuytren's contracture, limiting his mobility. He has also lived with benign paroxysmal positional vertigo.^[10]

• World MMA Awards
  • 2017 The Shawn Tompkins Coach of the Year^[12]
  • 2019 – July 2020 The Shawn Tompkins Coach of the Year^[13]
  • 2021 The Shawn Tompkins Coach of the Year^[14]^
• ^Voting period for 2019 awards ran from January 2019 to July 2020 due to the COVID-19 pandemic. Subsequently, the voting period for 2021 awards ran from July 2020 to July 2021.
• MMAjunkie.com
  • 2021 Coach of the Year^[15]
• Yahoo! Sports
  • 2020 Trainer of the Year^[16]
  • 2021 Coach of the Year^[17]
• Combat Press
  • 2021 Coach of the Year^[18]