Professionally, he has been a member of the Buffalo Bills, New Orleans Saints, Atlanta Falcons, Cleveland Browns, and Miami Dolphins of the NFL, in addition to the Montreal Alouettes of the Canadian Football League (CFL).

Zimmer played four seasons for the Ferris State Bulldogs, compiling a total of 216 tackles, 26 sacks, 48.5 tackles for a loss, 1 interception, 1 touchdown, 14 pass deflections, 9 forced fumbles, 1 fumble recovery, and 3 blocked kicks.

[7] Zimmer signed with the Montreal Alouettes of the Canadian Football League on September 21, 2017, and was added to the team's practice roster.

[8] He was promoted to the active roster and appeared in the Alouettes' final game of the season, recording three tackles and one sack.

[24] In Week 8 against the New England Patriots, Zimmer made a key play late in the fourth quarter, punching the ball out of Patriots quarterback Cam Newton's hands on a quarterback keeper as New England was driving down the field to either tie or win the game.

[25] In Week 10 against the Arizona Cardinals, Zimmer recorded his first career sack on Kyler Murray during the 32–30 loss.