He worked as Rhyno for WWE until 2005, when he signed with Total Nonstop Action Wrestling (TNA) and defeated Jeff Jarrett to win the NWA World Heavyweight Championship.

Gerin debuted in ECW on February 19, 1999, at a live event as "Rhino Richards", teaming with Nova to defeat the Full Blooded Italians (Tracy Smothers and Little Guido).

After working a few live events during his early months in the promotion, Gerin made his televised debut as a heel on the June 25 episode of ECW Hardcore TV as "Rhino", a comically aggressive, psychotic, and unstable powerhouse wrestler who reveled in extremely violent wrestling and ferocious brutality.

When ECW debuted on national television with a weekly show on TNN, the alliance of Rhino, Corino, Victory and Tajiri joined Cyrus to form a group called The Network.

He defeated Spike Dudley on the March 10 episode of ECW on TNN and advanced to the tournament final at Living Dangerously after The Sandman was eliminated by forfeit.

He debuted on the March 19, 2001, episode of WWF Raw is War, in Albany, New York at the Pepsi Arena, under the ring name Rhyno as a heel, aligning himself with Edge and Christian.

At Judgment Day on May 20, Rhyno, Edge, and Christian formed a stable with Kurt Angle known as Team RECK, with all four members reaching the semi-finals of the King of the Ring tournament.

[1] Rhyno returned to WWE television sixteen months later on the February 27, 2003, episode of SmackDown!, aligning himself with Chris Benoit and turning into a face as they defeated Matt Hardy and Shannon Moore.

[23] At Judgment Day on May 18, Rhyno teamed with Spanky and Chris Benoit to lose to John Cena and The Full Blooded Italians (Chuck Palumbo and Johnny Stamboli).

At SummerSlam on August 24, Rhyno competed in a fatal four-way match for the United States Championship against Guerrero, Benoit and Tajiri, but failed to win the title.

In the fall, Rhyno and Tajiri began pursuing the World Tag Team Championship and entered a feud with the champions La Résistance (Sylvain Grenier and Robért Conway), unsuccessfully challenging them for the titles at Unforgiven on September 12.

Rhyno and Tajiri received another title shot against La Résistance on the November 15 episode of Raw in a triple threat match, also involving William Regal and Eugene.

[1] Rhyno was released from his WWE contract on April 9, along with his friend Matt Hardy due to a public argument with his wife that took place at the WrestleMania 21 afterparty.

At Turning Point on December 2, he was scheduled to participate in a match teaming with Abyss to take on Black Reign and Rellik, but he was replaced by Raven due to injury.

Rhino beat James Storm to qualify for the King of the Mountain match at Slammiversary on June 8, where Samoa Joe retained the TNA World Heavyweight Championship.

Rhyno and Christian quietly went their separate ways, with Cage going to main events and Rhino along with then TNA Women's Champion Taylor Wilde starting a feud with The Beautiful People and Cute Kip shortly after Hard Justice.

At Bound for Glory IV on October 12, Rhino along with ODB and Rhaka Khan (who recently turned face) defeated The Beautiful People and Cute Kip in a Bimbo Brawl.

[61] When Hulk Hogan and Eric Bischoff took over TNA at the beginning of 2010, Rhino's angle was discontinued and Team 3D reverted to being faces and began feuding with The Nasty Boys.

Styles, Kazarian, Robert Roode, James Storm, Douglas Williams and Matt Morgan of Ric Flair's Fourtune stable, who thought they did not deserve to be in TNA.

[68][69] During the assault Abyss came out, fought Rob Van Dam backstage and caused him storyline injuries, which forced him to vacate the TNA World Heavyweight Championship and led to EV 2.0 looking for revenge.

[72] At Bound for Glory on October 10, Rhino, Dreamer, Raven, Richards and Sabu defeated Fourtune members Styles, Kazarian, Morgan, Roode and Storm in a Lethal Lockdown match.

[102] In his next ROH appearance at the Death Before Dishonor IX pay-per-view on September 17, Rhino and fellow Embassy member Tommaso Ciampa defeated Homicide and Jay Lethal in a tag team match.

On June 20, 2014, Rhino returned to TNA during the Impact Wrestling tapings, as he attacked Bully Ray on behalf of Ethan Carter III to help him win a Tables match, re-establishing himself as a heel in the process.

On the July 24 episode of Impact Wrestling, Rhino, Ethan Carter III and Rockstar Spud defeated Tommy Dreamer, Bully Ray, and Devon in a 6-man New York City street fight.

On the August 7 episode of Impact Wrestling, Rhino, Ethan Carter III, Snitsky, and Rycklon faced Team 3D, Tommy Dreamer and Al Snow in an Eight-Man Hardcore War but lost the match.

In September, Rhyno and Baron Corbin entered the Dusty Rhodes Tag Team Classic, defeating The Ascension in the first round and Johnny Gargano and Tommaso Ciampa in the quarterfinals.

At Sacrifice on March 13, 2021, Rhino joined Violent By Design (Eric Young, Deaner, and Joe Doering) by helping them defeat Chris Sabin and James Storm, turning heel.

[156][157] At Bound for Glory, after weeks of indecisiveness and silence, Rhino finally broke free from Violent By Design and rejoined his old tag team partner Heath.

At Bound for Glory, Rhino competed in the 20-person Intergender Call Your Shot Gauntlet where he made it to the final two being eliminated by Frankie Kazarian during the show he was also inducted into the TNA Hall of Fame.

Rhyno has been featured as an intimidating powerhouse with combined feats of strength and speed, known by various nicknames such as "The Rookie Monster", "The Big F'n Deal", "The Man Beast", "The War/Gore Machine"[166] and "Dr.