Country of origin: United States

Height: 6'1"

Weight: 185

Birth date: 1980-12-24

Record: 19-5-0

Jason "Mayhem" Miller is an American mixed martial arts middleweight fighter known for his flashy entrances and exciting fighting style. He primarily utilizes Brazilian Jiu-jitsu and Muay Thai, and trains at Team Quest in Temecula, California. Jason has also trained extensively with Randy Couture, Quinton Rampage Jackson and Marc Laimon.

"Mayhem", as he's referred to among his fervent fan base, has a fan club whose members refer to themselves as "The Mayhem Monkeys".

In the ring Mayhem wins the majority of his fights by submission. His flexibility is an asset in his ground game. He generally does not seem very affected by blows to the head, appearing to shrug them off.

Mayhem has fought in a variety of organizations, most notably ICON Sport and the Ultimate Fighting Championship He holds wins over tough competition such as Falaniko Vitale, Ronald Jhun, Egan Inoue, Denis Kang, and Robbie Lawler.

After the Ronald Jhun fight, a riot broke out and Miller was punched in the back of the head by a fellow fighter, Mark Moreno. This set the stage for a grudge match, and Miller dominated Moreno, finishing him with an armbar at the end of round one. Mayhem became most famous in a bloody battle with Canadian superstar Georges St. Pierre at UFC 52. He lost by decision.

On September 2, 2006, Mayhem won the Icon Sport Middleweight title from "Ruthless" Robbie Lawler by arm triangle in the third round. One of his rare losses came at the end of 2006 in an unexpected TKO delivered by Frank Trigg.

On October 5, 2006, Miller participated in Anything Goes, a professional wrestling event by Action Zone Wrestling, of which he is a fan. He challenged DDB to a "MMA Mayhem" match. He would go on to defeat DDB via tapout due to an armbar.

Along with his contract with Icon Sport, Miller also has a contract with the WEC.