[14][15] In December 2015, Quinlan was signed on as the lead male actor for the 2019 film, A Sense of Purpose: Fighting For Our Lives[16] by producer Jillian Bullock.

[17] In February 2020, Quinlan was selected to play the villain role of Marvel Rhino for the TV/Web Series: Spider-Man And The Monsters of Manhattan[18] set to be released in 2024.

[7][24] During this time Quinlan was coached by Jeff Walsh, Billy Conserva and Lawrence Cuzzi, with the assistance of Jim Cinelli, Manuel "Manny" Catalano Jr. and John Georgopolous.

On November 7, 1998, at the NABF Pro-Am America Nationals and Fitness Expo held in the Veterans Memorial Auditorium in Providence, Rhode Island, Quinlan finished second overall in the Junior Class.

[31] In February 2000, Quinlan tag-teamed with bodybuilder Jerry Ward (Lucian Bagwell) for Yankee Pro Wrestling, which later became known as Top Rope Promotions.

On July 2, 2000, while wrestling at the Thompson International Speedway in Connecticut, Quinlan received a Powerbomb from his opponent through a table on concrete outside the ring, fracturing one of the vertebrae in his lower back.

Often he would receive less than half of his expected income, which would ultimately force him to drop that gimmick and wrestle under the names Shane O' Kane[26][36] and John Quinlan.

Shortly after, Quinlan went to Atlanta with Peter Karalekas and met with Ernest Miller,[26] who was accompanied by Carmel Macklin and Michael Jai White about entering the World Championship Wrestling (WCW)'s Power Plant.

[26] The character was initially portrayed as an Irish thug from Hell's Kitchen, Manhattan, as a "heel" wearing black tights[37] with knee-high engineer boots, but was transitioned to a masked wrestler as a "face".

[26] In late August 2001 Quinlan and Leslie joined Jimmy Hart's newly founded Xcitement Wrestling Federation (XWF).

Quinlan was defeated by male model Anton Antipov for the title of Overall Men's Physique Champion in the judges' second call out shortly after in this contest.

[48] In May 2014, Quinlan competed at the Jay Cutler Classic Bodybuilding Championships in Boston, Massachusetts in the Men's Physique Open and Master classes.

[49] In October 2014, Quinlan competed at the NPC Brooklyn Grand Prix for the second year in a row in both the Men's Open and Master Physique Divisions.

In May 2015, Quinlan competed at the Jay Cutler Classic Bodybuilding Championships in Boston, Massachusetts in the Men's Physique Open and Master classes.

[57] Quinlan arm wrestled Chad Eaton, defensive tackle in the National Football League for the New England Patriots, in 2000 while working at the Boston nightclub The Rack as a bouncer.

[64][65] In February 2011, Quinlan was named January fashion model of the month by HUF Magazine[66][67] and he was interviewed by host Claudia Reid of Muscle Talk Radio 101 in New York.

[70] In September, Quinlan was selected to join VIP Exclusive Fashion Models Company[71] by President Leslie M. Weston and CEO Terrance L. Shaw and appeared in Faith & Fitness Magazine with his son Troy.

[citation needed] In April 2012, Quinlan was named official image model of the year for No Limits Brand Underwear by Suzanne Carner.

[79] Quinlan has modeled products and brands of apparel for Perry Ellis, Energy Bomb Sports Drink, Truly Huge, JUSTUS Clothing Co., Joe Snyder, XWear, Teamm8, Male Basics, Muchachomalo (Netherlands), Croota, Tribe (Australia), Sweat Collection, DMK, 4Skins, Modus Vivendi by Christos Bibitsos (Greece), Xzytes, Toot (Tokyo, Japan), Ergowear (Santiago, Chile), Diego Barberi (Switzerland), Audace, Dietz, Way Funky Co., Men's Fit, Man by Peter Morrissey, Unapproved Clothing Co., Tiger Underwear, Boqari, BIG BOYS, Stunt Gear Inc., HOM, The Todd Sanfield Collection, Nutrabolics, No Limits Underwear, Athletic Xtreme Supplement Company, Swole Gym Gear, Ken Fron Jewelry[80] and Tulalip Casino.

[26][88] Quinlan portrayed a mobster with a good heart in a video short included in Poughkeepsie Enhanced Collector's Edition released in Fall 2013.

In December 2015, Quinlan was signed on as an actor to play the role of United States Army Captain Jake Nixon for the 2019 movie production, A Sense of Purpose: Fighting For Our Lives by producer and director Jillian Bullock.

[90][91][92] In September 2017, Quinlan was the featured actor in the A Sense of Purpose: Fighting For Our Lives movie music video Calm Down by Antonia Marquee.

[99] Colonel Annette Tucker Osborne, President of The National Association of Black Military Women, Brooklyn Chapter awarded Quinlan the Challenge coin for his role in the film.

[100] During an interview with Conversations Radio Network President Cyrus Webb at the event, Quinlan credited Sylvester Stallone as his biggest inspiration as an actor.

[101] In May 2019, during a Philly On The Rise television interview, host Michael Pleasant discussed the meaning behind Quinlan's nickname Stoneface which he earned the over the years from all the people who say he never smiles.

[104] On February 18, 2020, Quinlan was selected to play the villain role of Marvel Rhino aka Aleksei Sytsevich for the TV/Web Series: Spider-Man And The Monsters of Manhattan[18] set to be released in 2024.

On September 21, 2020, he was chosen to play the role of an intimidating security guard in the short film, Quartette by Bianca Sanchez and director Jon Barden.

[107] In November 2022, Quinlan was selected for the role as Detective Decker Monroe in Jillian Bullock's upcoming film, A Cup Full of Crazy.

Quinlan was the cover model and inspiration for the character, Zane (A Dragon Shifter), in the Award Winning, Urban Fantasy/Norse Mythology Romance novel by Author Jennifer Sage titled, "The Last Valkyrie."

The cover artist, Claudia McKinney with Phatpuppy Art Studios, did an impeccable job at capturing the features needed for "Zane" through Quinlan's physique, which was a perfect match.