[6][8] He was a wrestling fan from the age of 12, particularly enjoying The Hart Foundation and The British Bulldogs, and attended SummerSlam in 1992 while wearing The Ultimate Warrior face paint.

[9] In September 1998, Haworth began training under Les Thatcher in the Heartland Wrestling Association (HWA) in Cincinnati, Ohio, incurring large debts in the process.

He debuted in September 1999 under the ring name "Nigel McGuinness", defeating GQ Masters III in a match that was featured on ABC's 20/20.

McGuinness developed a heel character which he described as "a punk rock soccer hooligan... Billy Idol meets Johnny Saint".

McGuinness defeated Hoss to begin a second reign with the title on 6 January, and held it until 17 March 2004, when he lost to El Temor.

During the rest of 2006, McGuinness was mostly uninvolved in the war between ROH and Combat Zone Wrestling (CZW), instead developing a new gimmick where he would win his matches by countout by using (often unfair) methods of preventing opponents from returning to the ring.

During this feud McGuinness also received two shots at the ROH World Championship, on 14 April and 16 July, but was both times defeated by champion Takeshi Morishima.

[1] On 2 November, the first night of ROH's Glory by Honor VI event in Philadelphia, Chris Hero and his agent Larry Sweeney complained of McGuinness' injury, calling him a fluke champion.

Sweeney felt that Hero's victory of the Survival of the Fittest in Las Vegas earned him a title shot any time he wanted.

[21] On 25 January 2008, McGuinness wrapped up his feud with Chris Hero by successfully defending his title against him in a steel cage match.

[22] Throughout the rest of the year, McGuinness successfully defended his title against the likes of Tyler Black, Austin Aries, Kevin Steen, Claudio Castagnoli, Go Shiozaki, Jerry Lynn, Roderick Strong, El Generico and on 22 November 2008, at Rising Above, in a grudge match against Bryan Danielson.

[1] However, despite the injury reportedly requiring surgery, he still wrestled at the Seventh Anniversary Show the next night and defeated KENTA to retain his title.

[1][23][24] Finally, on 3 April 2009 at Supercard of Honor IV, McGuinness lost the ROH World Championship to Jerry Lynn at his 39th defence, ending his reign at 545 days.

On 24 July, McGuinness suffered a minor injury during a four-way match after his "spine got compacted taking a piledriver", and was unable to wrestle the following night.

[30] On 31 August 2005, McGuinness competed in Ohio Valley Wrestling, WWE's developmental territory, on episode of its OVW TV, losing to Elijah Burke.

[1] He wrestled nine matches in total, seven of which he won, and teamed with fellow gaijin Doug Williams, 2 Cold Scorpio and Bison Smith.

[27] On 20 October 2009, it was reported that Haworth's deal with the WWE had fallen through due to him failing a pre-screening physical test after feeling an old biceps injury needed surgery[33][34] and that he had decided to sign with TNA instead.

[35] He officially made his TNA return as a heel under the ring name Desmond Wolfe on 22 October episode of Impact!

[40] Following the loss to Angle, Wolfe moved on to feuding with D'Angelo Dinero, who defeated him on 4 January 2010, three-hour, Monday night episode of Impact!.

[49] At Lockdown, along with Sting, Robert Roode and James Storm, Wolfe represented Team Flair in the annual Lethal Lockdown match, where they were defeated by Team Hogan (Abyss, Jeff Jarrett, Rob Van Dam and Jeff Hardy), when Abyss pinned Wolfe.

[60] Two weeks later on Impact!, Flair revealed Robert Roode and James Storm as the final two members of Fourtune, leaving Wolfe out of the stable.

[70] On 16 December episode of Impact!, Magnus met his former tag team partner Doug Williams and informed him that Wolfe was now done with football and would be coming back soon, while also telling him that they had gotten rid of Chelsea.

[71] Wolfe finally made his return in a non-televised segment on 10 December 2010, at the tapings of the 6 January 2011, episode of Impact!, when he and Magnus saved Williams from Fortune members A.J.

[83] On 25 November, McGuinness returned to the United Kingdom, when he was defeated by Eddie Edwards in a Fight Club: Pro Championship three-way match in Wolverhampton, which also included Trent Seven.

He would compete in his final matches at APWA's 3rd Annual Holiday Grand Prix, which was a two-night show in Clarksburg, WV.

[33][93][94][95] In late May 2013, McGuinness toured the United Kingdom with the shorter final cut of his documentary and has become an advocate for hepatitis B vaccination and an end to the use of intentional blood loss in wrestling.

In 2014, following the success of his documentary, McGuinness began working in the film industry as an Assistant Editor and Production Assistant on various television shows and in December of that year launched a Kickstart campaign for his new creative project, L.A. Fights, described as a scripted show about "a diverse group of amateur fighters and their morally ambivalent promoter struggle to coexist in their upstart fight league".

McGuinness made his commentary debut at the WWE United Kingdom Championship Tournament on 14 and 15 January 2017, alongside Michael Cole.

[106] McGuinness made his in-ring return at All In at Wembley Stadium on 25 August 2024 as the third entrant of the Casino Gauntlet, but was unsuccessful in winning.

On 20 December at Final Battle, McGuinness answered Lee Moriarty's open challenge for the ROH Pure Championship, but failed to win the title.