Stefanski played defensive back at Penn in college, but has been a coach who favors offensive play.

He began his career under the long-time offensive director Brad Childress. Then, he worked up through the Vikings organization, becoming a tight end, running backs and quarterbacks coach, before being appointed their full-time coordinator in 2019.

In his first season, the Vikings offense went from being the 19 ^th to the 8th, scoring an average of 25.4 points per match. After that breakthrough season, the Browns hired him to be their head coach.

Stefanski, who was Cleveland’s offensive play-caller during much of his time there, was open to changing direction.

After a slow offensive start, he handed over these duties to Ken Dorsey at the mid-point of the 2024 campaign. He returned to playcalling duties at the beginning of the 2025 campaign, but handed that responsibility back to Tommy Rees in the final weeks.