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World Extreme Cagefighting
Simpson made his WEC debut against accomplished grappler David Avellan at WEC 36. Simpson won in the first round with a highlight-reel KO.
Ultimate Fighting Championship
Simpson was part of the transfer of Light Heavyweight and Middleweight fighters in the WEC to the UFC. He made his debut at UFC Fight Night 18 by defeating Tim McKenzie via TKO in the first round.
He was set to have his second fight against Dan Miller on September 16, 2009, at UFC Fight Night 19. Instead the fight was moved to UFC 102 where he fought Ed Herman. Simpson won by technical knockout when Herman went down with a knee injury in the second round.
Simpson faced Tom Lawlor on January 11, 2010, at UFC Fight Night 20, defeating him via controversial split decision.
Simpson was expected to face Chris Leben at UFC 114, but the bout took place instead on June 19, 2010, at The Ultimate Fighter: Team Liddell vs. Team Ortiz Finale. Simpson lost the fight via TKO at 4:17 of round 2. Simpson started out strong, using his wrestling to bring the heavier hitting Leben down multiple times. In the second round, Simpson came out gassed and ate multiple shots against the cage before turning and running away, falling against the cage, forcing the referee to save him.
Simpson was expected to face David Branch on September 15, 2010, at UFC Fight Night 22, but was forced to pull out of the bout with a staph infection.
Simpson faced Mark Muñoz on November 20, 2010, at UFC 123. He lost the fight via unanimous decision.
Simpson returned to winning by defeating Mario Miranda on March 26, 2011, at UFC Fight Night 24. Simpson dominated the fight by controlling Miranda on the ground en route to a unanimous decision victory. The judges scored the fight (30–27, 30–27, 30–26).
Simpson was expected to face returning UFC veteran Jason Miller on July 2, 2011, at UFC 132. However, on May 27, 2011, it was revealed that Miller would be one of the coaches of The Ultimate Fighter Season 14, opposite to Michael Bisping and had been pulled from the bout, while Simpson faced Brad Tavares. Simpson won via unanimous decision.
Simpson was expected to face Nick Catone on October 8, 2011, at UFC 136. However, Catone was forced out of the bout after tearing an Achilles tendon, and replaced by Eric Schafer, who he defeated by unanimous decision.
Simpson faced Ronny Markes on February 15, 2012, at UFC on Fuel TV 1. Markes defeated Simpson via split decision.
Following his split decision loss to Markes, Simpson confirmed he would drop down to the Welterweight division.
Simpson was expected to face Jon Fitch on July 11, 2012, at UFC on Fuel TV: Munoz vs. Weidman. However, Fitch pulled out of the bout citing a knee injury and was replaced by returning veteran Kenny Robertson. Simpson won a unanimous decision over Robertson.
Simpson fought Mike Pierce on October 5, 2012, at UFC on FX 5. After nearly finishing Pierce on two occasions in the first round, Simpson was knocked out 29 seconds into the second round. After the loss, the UFC chose not to renew Simpson's contract.
World Series of Fighting
Following his UFC release, Simpson signed with the new MMA company World Series of Fighting. He fought Josh Burkman at World Series of Fighting 2 on March 23, 2013. He lost his debut via TKO in the first round.
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Milestones
Former Youth Teams ![]()





