Benjamin "Benny" Severide is Kelly's father, and former firefighter who served with Wallace Boden on Squad 4. He was also a former Captain in Arson Investigations.

In Season 2, Gail McLeod plots a way to overthrow Chief Boden and recruits Benny to see if he will command Firehouse 51. He accepts, but then he backs out, realising his friendship with Wallace is more important.