John McCarthy

John Michael McCarthy (born October 12, 1962) is a retired American mixed martial arts referee best known for officiating numerous bouts promoted by the Ultimate Fighting Championship (UFC), dating back to UFC 2.

He is credited as being one of the greatest and most recognizable referees in combat sports history and an important figure in the mixed martial arts world, helping create the Unified Rules of MMA after initially creating the original rule book of the UFC.

He is currently a commentator for Bellator MMA and co-hosts the combat sports-based podcast "Weighing In" with former fighter Josh Thomson.

In 1993, he became involved with the newly created Ultimate Fighting Championship (UFC) fighting tournament.

He was the referee for UFC 2, launching a career as a UFC referee.

The UFC initially started with very few rules, but McCarthy gave feedback that it was too dangerous and suggested additional rules, many of which were adopted.

McCarthy would often start matches by saying "let's get it on" to the fighters, this became an iconic catchphrase that is associated with him and his refereeing.

The nickname of "Big John" came about because of his size and stature.

He stands 6ft 3in and weighs 265 lb; making him larger than the majority of the athletes over whom he presides.

According to a UFC interview, the nickname was given to him by UFC co-founder and promoter Art Davie.

McCarthy recalls that the nickname began when he forcibly lifted Davie off the ground and held him in the air.

McCarthy spent some time as an officer of the Los Angeles Police Department, retiring around 2008.

On September 1, 2011, McCarthy's autobiography, Let's Get It On - The Making of MMA and its Ultimate Referee, was published.

McCarthy had a cameo appearance in the Friends episode, "The One with the Ultimate Fighting Champion".

McCarthy also served as the referee on the MTV2 series Bully Beatdown, along with professional mixed martial artist Jason "Mayhem" Miller.

McCarthy has two sons and a daughter, one of whom has been an MMA judge since 2013.

McCarthy currently resides in Tennessee.

McCarthy is featured in the award-winning mixed martial arts documentary Fight Life, the film is directed by James Z. Feng and released in 2013.

McCarthy appeared in Season 3b, Episode 5 of Entourage.

McCarthy appeared at the end of the film Never Back Down 2: The Beatdown.

In 2018, McCarthy retired from UFC refereeing, and moved to Bellator as a commentator.