He played college basketball and football at Western Kentucky, and was signed by the Seattle Seahawks as an undrafted free agent in 2016.

Fant attended Warren Central High School where he lettered and started all four years in basketball.

[1] Throughout his first four years at Western Kentucky, friends and coaches urged Fant to join the Hilltopper football team but he refused.

[2] Fant used his fifth year of eligibility to join the Western Kentucky Hilltoppers football team as a tight end.

[5] Fant was expected to go undrafted after playing only a single year of tight end at the collegiate football level.

Due to his limited experience, Fant was not one of the 15 collegiate tight ends to attend the NFL Scouting Combine.

On March 29, 2016, he attended Western Kentucky's pro day, along with Brandon Doughty, Tyler Higbee, Prince Charles Iworah, and 11 other prospects.

Although he did not have game film, he was able to impress enough with his athletic ability and size that the Seahawks signed him solely based on that single workout.

He made his professional regular-season debut on October 23, 2016, and played 24 snaps after Sowell sprained his knee during the 6–6 tie with the Arizona Cardinals.

He made his first career start during Week 8 against the New Orleans Saints after Sowell was still unable to play due to injury.

[3] On November 13, 2016, he made his third career start against the New England Patriots and was credited with not committing a single assignment error in the Seahawks' 31–24 victory.

Fant had great success in this new role and helped the 2018 Seahawks achieve the number one ranked rushing offense in the league.

On December 10, 2018, in a week 13 Monday Night Football matchup against the Minnesota Vikings, Fant recorded his first career reception, a 9-yard pass from quarterback Russell Wilson.

He also functioned as the primary backup offensive tackle, filling in for an injured Duane Brown during parts of the season.

[15] On December 2, 2019, in a Monday Night Football matchup against the Vikings, Fant garnered attention for helping the Seahawks rush for a season-high 218 yards in a 37–30 win.

[24] Fant is married to former Western Kentucky women's basketball player Chastity Gooch and has three children with her.