Grissom was introduced as a former Deputy District Chief who took over as Commissioner for the Chicago Fire Department. He was a mentor to Chief Wallace Boden and had a significant impact on the firehouse. However, he eventually retired from his position.
In the series “Chicago Fire,” Jerry Gorsch, played by Steven Boyer, was appointed by Deputy District Chief Joel Tiberg, played by Damon Dayoub, as the new Commissioner, replacing Grissom. Grissom’s character, portrayed by Gary Cole, was a seasoned and respected firefighter who had climbed the ranks to become Commissioner. His relationship with the firefighters of Firehouse 51, particularly Chief Wallace Boden, was complex, as he often had to balance the politics of the department with the well-being of his firefighters.
Grissom’s tenure as Commissioner saw several challenges, including budget cuts and clashes with the firehouse crew over various decisions. Despite these conflicts, he was seen as a fair leader who ultimately wanted what was best for the department. His departure from the show was not marked by any scandal or dramatic event; rather, he stepped down from his role, paving the way for new leadership within the Chicago Fire Department. This allowed for new storylines and character developments within the series, as the firehouse adapted to the changes in leadership.