Helfrich didn't call plays as Oregon's offensive coordinator and he won't in Chicago.
But the move to professional football comes after Helfrich spent the 2017 season as a college football television analyst for Fox Sports, a position which he accepted after being fired from Oregon's head coaching position in November of 2016.
After Kelly left, Helfrich became the head coach and reached the National Championship Game in 2013 with Marcus Mariota.
Mark Helfrich: The former OR head coach will serve as Nagy's offensive coordinator, although Nagy is expected to call his own plays.More news: Did Meghan Markle inspire Kate Middleton's latest look?
More news: BJP to hold 'Jail Bharo' agitation against Siddaramaiah govt
More news: Bruno Mars, The Killers and Muse Headline This Year's Bottle Rock
Helfrich was also reportedly offered the offensive coordinator position at UCLA by Chip Kelly-an especially enticing proposition for southern OR football fans given Chase Cota's commitment.
This is a big piece of news for Matt Nagy and his staff. Nagy spent the past decade working under Andy Reid in Philadelphia and Kansas City, serving as the Chiefs' sole offensive coordinator this past season. The Bears were 5-11 this past season and haven't finished above.500 since they let Lovie Smith go following a 10-6 finish in 2012, two years after their last visit to the playoffs. The question is if Trubisky can handle it in his second year. His salary with the Bears will mitigate what the school still owes him.
General manager Ryan Pace, who recently got a contract extension through the 2021 season, announced the decision and will have a lot riding on Nagy's performance.
This week has been a bit of a roller coaster for Chicago Bears' fans as they wait the fate on popular defensive coordinator Vic Fangio. It accomplished that while losing six starters or key contributors to injured reserve: outside linebackers Leonard Floyd, Willie Young and Pernell McPhee, inside linebacker Jerrell Freeman, safety Quintin Demps and defensive end Mitch Unrein.