The son of long-time NFL coach Bill Callahan, Brian Callahan got his NFL start with the Denver Broncos as an offensive assistant under Josh McDaniels. He stayed with the Broncos for several seasons and was part of their excellent offenses under Peyton Manning and their Super Bowl-winning roster in 2015. Callahan was the Offensive Quality Control coach for the 2011 and 2012 seasons and was promoted to be an Offensive Assistant with the Quarterbacks for 2013, 2014, and 2015.
Callahan’s main job in Denver was scouting, getting practice installs ready, running film, and working with the quarterbacks.