The Chicago Bears are filling the vacancies on their offensive staff. After firing four coaches, including offensive coordinator Mark Helfrich, offensive line coach Harry Hiestand and tight ends coach Kevin Gilbride, the Bears have added three new faces to Matt Nagy’s coaching staff.

Juan Castillo has joined the Bears as the offensive line coach, Clancy Barone was added as the new tight ends coach, and now Chicago has found its new offensive coordinator in Bill Lazor.

Here are five things to know about the Bears’ new offensive coordinator:

1. Lazor’s offenses haven’t been the most productive

It’s no secret that the Bears were courting new Broncos offensive coordinator Pat Shurmur, who ultimately chose Denver over Chicago. Shurmur has a proven track record as an offensive coordinator and working with quarterbacks. The same can’t be said for Lazor.

During his four years as an offensive coordinator, Lazor’s offenses were some of the worst in the league. The Bengals were the worst offense in the NFL in 2017, and just once have his offenses finished higher than 26th. That came with the Dolphins in 2014, where they finished 14th during his first year as an offensive coordinator.