In 2002, McCarthy spoke at the Association of Boxing Commissions, delivering a presentation on MMA’s merits. He would address the association three more times at its annual events, and was later invited back to teach educational seminars for both the ABC and International Professional Ring Officials Association (IPRO). McCarthy has also travelled and taught at nearly 20 individual athletic commissions in North America.

McCarthy served a police officer with the Los Angeles Police Department from 1985 to 2007. McCarthy was awarded his Tactic/Self Defence Instructor Certification by the LAPD on August 12, 1993, and taught until his retirement on Sept. 15. In his 22 years on the force, McCarthy instructed over 10,000 recruits in Arrest and Control procedures and survival tactics.

In 2007, California State Senator James Battin awarded McCarthy with a commendation for his “career accomplishments” in the sport, “for the work he has done to increase the safety, visibility, and importance of mixed martial arts.”

In a separate proclamation, the California State Athletic Commission also recognized McCarthy for his “dedication and commitment to other officials in helping developing their skills and concern for athletes.”

McCarthy was inducted into the Masters Hall of Fame in 2006 for his “outstanding achievements in the martial arts,” and was its guest speaker at its 2007 gala.

In Sept. 2006, Brazilian jiu-jitsu black belt McCarthy opened Big John McCarthy’s Ultimate Training Academy (BJMUTA), the first fully functional MMA gym in Valencia, Calif., where he also teaches.