He played college football at William Penn University and was signed by the New York Jets as an undrafted free agent in 2012.

[3] He decided to take on football for his senior year, playing both offensive and defensive line, and was an all-district and all-Southwest Louisiana selection in 2006.

[4] Since much of recruiting takes place during a high school player's junior season, Harrison was overlooked by college scouts and wound up without any scholarship offer after his graduation.

He enrolled at Northwest Mississippi Community College, but dropped out after the first semester to work as a night stocker at Walmart in Lake Charles.

[6] Prior to the draft, Harrison worked out at Iowa State's pro day, and was "considered a late-round prospect in a weak class of nose tackle.

After receiving a seventh-round grade by Jeff Bauer, Jets' director of college scouting, Harrison went undrafted in the 2012 NFL draft.

Following the departure of Sione Pouha and a preseason injury to Kenrick Ellis, Harrison was named the starting defensive tackle for the 2013 season.

[11] On October 20, 2013, Harrison recorded his first career sack when he brought down New England Patriots quarterback Tom Brady.

[21] After being a healthy scratch in week 16 against the Los Angeles Rams, Harrison requested to be released and the team waived him on December 28, 2020.