Kromer began his NFL coaching career in 2001 with the Oakland Raiders. In 2003, he helped lead the Raiders to an AFC championship and to Super Bowl XXXVII. Kromer was hired by the New Orleans Saints in 2008 as the running backs coach, before becoming the offensive line coach the following season. Under his tenure as OL coach, the Saints sent five players to a combined nine Pro Bowls, and tied for the fewest sacks in the league with 96. Under Kromer, the Saints line twice won the Madden Most Valuable Protectors Award as the bestoffensive line in the league. The Saints won Super Bowl XLIV with Kromer. He filled in as the Saints' interim head coach for the first six games of the 2012 NFL season as Joe Vitt and Sean Payton served their suspensions for "BountyGate". The Saints went 2-4 during that season-opening stretch, losing each of their first four games by eight points or less. On January 16, 2013, Kromer was announced as the new offensive coordinator and offensive line coach for the Chicago Bears. He joined Marc Trestman's initial coaching staff, after working with Trestman in Oakland. In his first year, the Bears offense had the second-best scoring offense in the league with 445 points, behind the Denver Broncos, while finishing fifth with 4281 passing yards. The offense also broke team records in total yards, passing yards, passing touchdowns and first downs. On February 12, 2014, offensive line assistant Pat Meyer was named offensive line coach while Kromer, who served as offensive coordinator and line coach in 2013, remained the offensive coordinator and continued to be involved in all aspects of the offense, including the line with an increased role with the passing game. On January 17, 2015, the Buffalo Bills reached a two-year deal with Kromer to be the team's new offensive line coach. He was later suspended for 6 games by the Buffalo Bills from an incident in which he was accused of striking a group of minors who were caught committing theft of property and vandalism. Two weeks later all charges were dropped against Kromer. On January 30, 2018, Los Angeles Rams head coach Sean McVay promoted him to run game coordinator, after Matt LaFleur left to become the offensive coordinator of the Tennessee Titans. In order to help fill the void, McVay also named tight ends coachShane Waldron the pass game coordinator. In 2019 Kromer helped coach the Rams to an NFC Championship and to Super Bowl LIII.
