While the offense failed to finish drives, Jordan Mosley and Lawtez Rogers had standout performances on defense.
The All-Big Ten honorable mention is looking to pick up right where he left off.
Brian Stewart, Ron Zook and Zohn Burden will join Mike Locksley on the sidelines.
Campbell led the Terps with 10.5 sacks per game in 2020.
Brian Braswell is also joining Mike Locksley's staff as the Terps' new offensive line coach.
Offensive line coach John Reagan has also left College Park.
Lewis is the highest-rated inside linebacker in the 2021 class.
The Terps also secured wide receiver Marcus Fleming as a transfer from Nebraska.
The move was made due to a pause in team activities, which was caused by a COVID-19 outbreak.
The recruiting class is led by four-star linebacker Demeioun Robinson.