The Saskatchewan Roughriders named Mueller their Offensive Co-ordinator on Dec. 6, 2023. In his first year in the role, he led an offensive group that significantly contributed to the team’s winning record and second-place finish. 

That was a prelude to a 2025 season that ended with a Grey Cup championship for the Roughriders. It was the third championship season for Mueller, who earned Grey Cup rings as an assistant coach with the Calgary Stampeders in 2014 and 2018.

Born and raised in Regina, Mueller returned to his home province with a near-decade of CFL coaching experience. He was a member of the Stampeders’ coaching staff from 2014 to 2023.

Mueller is a grandson of Roughriders legend Ron Lancaster. Mueller’s father, Larry, was the Roughriders’ assistant general manager for three years, beginning with the championship season of 1989. Lana Mueller, Marc’s mother, is a former parking lot attendant outside Taylor Field. 

Like his grandfather, Mueller was a quarterback of note. He starred for the Sheldon-Williams Spartans before spending six seasons with the University of Regina Rams. He attended a CFL training camp with Edmonton and made one pre-season appearance – at historic Mosaic Stadium on June 17, 2011. He completed three of three passes for 45 yards. 

Mueller’s wife, Jenaya, was a member of the Roughriders’ Cheer Team from 2007 to 2013. The first and final seasons of that span were Grey Cup years for the Roughriders. Marc and Jeyana have two children — Sawyer and Wallace.