[citation needed] He attended Archbishop Molloy High School and served as a peer tutor, homeless shelter volunteer, and National Honor Society member.

[15] After graduating from NYU, Morrissey founded a ticket brokerage specializing in events held at Madison Square Garden and Yankee Stadium.

[26] Morrissey wrestled his first televised match under the ring name of Colin Cassady on the September 4, 2011, episode of FCW TV in a disqualification loss to Richie Steamboat.

[33][34] Cassady then formed a villainous tag team with Enzo Amore,[35] who had also previously lost to Ryan,[36] and they labelled themselves "the realest guys in the room".

[35][37][38] In real life, Cassady first met Amore at the age of 15, when they played basketball together at West Fourth Street Courts in Manhattan, New York.

[37] Ryan ultimately had the last laugh when he caused Amore and Cassady to be attacked by Tons of Funk (Brodus Clay and Tensai).

[38] Amore and Cassady then feuded with Sylvester Lefort and his stable of Alexander Rusev and Scott Dawson, turning them face in the process.

[41][42] On the September 25 episode of NXT, Amore and Cassady participated in a gauntlet match for a future title shot at the NXT Tag Team Championship; they started the match and defeated Tyler Breeze and CJ Parker, then beat Rusev and Dawson, before falling to their final opponents, The Ascension (Conor O'Brian and Rick Victor).

[43] Amore suffered a legit broken leg in November 2013, which led Cassady to try his hand at singles competition, feuding with Aiden English.

Amore and Cassady defeated The Lucha Dragons (Kalisto and Sin Cara) in a number one contender's match for a title opportunity against Blake and Murphy.

[53] On the April 14 episode of SmackDown, Amore and Cassady defeated The Ascension in their main roster debut match, advancing in the WWE Tag Team Championship number one contenders tournament.

On the August 22 episode of Raw, Cass defeated United States Champion Rusev by countout to qualify for the fourway elimination match for the WWE Universal Championship.

Cass lost a handicap match against Rusev and Jinder Mahal before teaming up with Enzo to defeat the duo twice, ending the feud.

At Fastlane, Enzo and Cass unsuccessfully challenged Luke Gallows and Karl Anderson for the Raw Tag Team Championship.

The next night on Raw, Cass suffered a legitimate knee injury, a torn ACL, during a Brooklyn Street Fight against Amore.

[62] According to Sports Illustrated, Morrissey's release was due to behavioral issues including public intoxication during a WWE tour and disobeying direct orders from Vince McMahon, in particular relating to the handling of an angle involving an attack on a little person who was impersonating Daniel Bryan on the May 1 episode of SmackDown.

[65] Morrissey also made an appearance at House of Hardcore 52 on December 8, but during the show's intermission was rushed to a hospital after suffering a seizure (see personal life).

Following a tag team match involving Ring of Honor and New Japan Pro-Wrestling talent, the two jumped the barricade and attacked several wrestlers.

[69] Morrissey was inactive from wrestling from September 2019 to February 2021, and he defeated Christian Mox at SWE Clash in Canton in his return match.

On April 25, 2021, at Rebellion, as W. Morrissey, he made his Impact Wrestling debut as the surprise replacement for Eric Young in Violent by Design's match against Chris Sabin, Eddie Edwards, James Storm, and Willie Mack.

At Rebellion, Morrissey and Jordynne Grace competed in an Eight-Team Elimination Challenge for the Impact World Tag Team Championship which was won by Violent By Design.

[75][76] On the May 4, 2022, episode of Dynamite, Morrissey made his debut in All Elite Wrestling (AEW) as a heel character, serving as MJF's pick for Wardlow's mystery opponent.

[80] On the October 7 episode of Collision, Big Bill and Starks defeated FTR (Dax Harwood and Cash Wheeler) for the AEW World Tag Team Championship.

Big Bill and Starks lost the titles to Sting and Darby Allin in a tornado tag team match on the February 7, 2024 episode of Dynamite, ending their reign at 123 days.

[82] In May 2024, Big Bill joined The Learning Tree stable headed by FTW Champion Chris Jericho, and on the June 12 episode of Dynamite he was dubbed "The Redwood".

[83][84] In June 2024 at Forbidden Door, Bill teamed with Jericho and Jeff Cobb in a losing effort to Hook, Katsuyori Shibata, and Samoa Joe.

[85] On the November 23 episode of Dynamite Bill assisted Jericho to defeat Mark Briscoe in a Ladder War for the ROH World Championship.

[91] Morrissey met his future tag team partner Eric Arndt (Enzo Amore) when they played basketball together at the Cage in Manhattan, New York, nearly 10 years before they reunited in WWE in August 2013.

[92] During their time in Florida Championship Wrestling (FCW), Morrisey roomed with fellow wrestler Jonathan Good, known as Dean Ambrose in WWE and Jon Moxley in AEW.

[94] On September 14, 2019, Morrissey was involved in an incident backstage at a WrestlePro independent show where he allegedly confronted and tried to fight Joey Janela (who was involved in an incident with Morrissey's tag team partner, Eric Arndt, months earlier) and he also allegedly confronted and spat in the face of independent wrestler Pat Buck.