High school career

Johnson attended Gonzaga High School in Washington, D.C., U.S. He played both wide receiver and defensive back. As a senior, he caught 22 passes for 269 yards and two touchdowns. He was named to the second-team all-conference at wide receiver. He was also a standout basketball player, earning all-conferencing honors.

Considered only a three-star recruit by Rivals.com, he was rated as the No.40 safety prospect in the nation. He accepted a scholarship to Virginia over other offers from Syracuse, Pittsburgh, and Maryland.

College career

As a freshman in 2008, he played in 6 games, mostly as a reserve linebacker and on special teams. He recorded 7 total tackles, including 2 tackles for loss. In 2009, he played in all 12 games for the Cavaliers, starting in 10 of them as an outside linebacker. He recorded 40 tackles including 5 tackles for loss and 2 sacks. In 2010, the Cavaliers defense switched their scheme from a 3-4 to a 4-3, allowing Johnson to move from outside linebacker to defensive end. As a junior in 2010, he started in 12 games, and recorded his best statistical season of his career. He recorded 53 total tackles, including 14.5 for loss and 6.5 sacks, he also recovered two fumbles. In 2011, his final season, his performance dropped off due to several nagging injuries, but still managed to start in all 12 games. He recorded 30 total tackles, including 11 tackles for loss and 4 sacks, he also forced two fumbles and recovered one.

College statistics

Year	G	GS	Tackles	TFL - Yards	Sacks - Yards
2008	6	0	7	2.0 - 3	0 - 0
2009	12	10	40	5.0 - 45	2 - 25
2010	12	12	53	14.5 - 61	6.5 - 45
2011	12	12	30	11.0 - 36	4.0 - 25
Tot.	42	34	130	32.5 - 145	12.5 - 95

Professional career

NFL Draft

Pre-draft measurables

Ht	Wt	Arm length	Hand size	40-yd dash	10-yd split	20-yd split	20-ss	3-cone	Vert	Broad	BP	Wonderlic
6 ft 3 in	268 lb	33 1/2 in	9 in	4.81 s	1.66 s	N/A s	4.38 s	7.20 s	35 in	8 ft 9 in	N/A reps	N/A

San Francisco 49ers

Johnson was drafted by the San Francisco 49ers in the seventh round (237th overall) of the 2012 NFL Draft.

Indianapolis Colts

Johnson was acquired by the Indianapolis Colts via trade with the San Francisco 49ers in exchange for a conditional draft pick on September 2, 2013. On September 5, 2015, Johnson was waived by the Colts.

Cleveland Browns

On September 22, 2015, Johnson was signed to the Cleveland Browns' practice squad.

[ Source: Wikipedia ]