Johnson did not miss a single game in his collegiate career.[3] As a freshman at Toledo in 2018, he played in all 13 games and totaled eight tackles.[2] He then made 23 tackles in 12 games during the 2019 season, being mainly used as a reserve.[2] He then won a starting role in 2020 and did not miss a start for the rest of his collegiate career.[3] Johnson was the team leader in tackles in 2020 with 47, also posting 4.5 tackles-for-loss (TFLs) that year.[2] In 2021, he was named third-team All-Mid-American Conference (MAC) while recording 86 tackles (fourth on the team), eight TFLs, 2.5 sacks and an interception.[4]
As a senior in 2022, Johnson placed second on the team with 109 tackles and was named second-team All-MAC.[2][3] He also made eight TFLs, three sacks and three passes defended.[5] He helped the Rockets win the 2022 MAC Championship Game and was named the defensive MVP of the game after recording eight tackles.[6] Johnson was invited to the Hula Bowl all-star game and concluded his collegiate career having totaled 273 tackles, 22.5 TFLs and 6.5 sacks in 57 games played.[3][7]
After going unselected in the 2024 NFL draft, Johnson signed with the New York Giants as an undrafted free agent.[7] He was waived at the final roster cuts, on August 29, and re-signed to the practice squad the next day.[9][10] After having spent the entirety of the 2023 season on the practice squad, he signed a reserve/future contract with the Giants on January 8, 2024.[11] He was a standout performer in training camp in 2024.[12] He recorded four tackles, two for a loss, and a sack in the preseason opener against the Detroit Lions, but suffered an ankle sprain in the game that led to him missing the rest of preseason.[13][14] He was announced to have made the team's initial 53-man roster after surviving cutdowns on August 27, but was placed on injured reserve the following day later due to his injury from preseason.[15][16] He was activated on December 24.
