HAAS: We were approached by Dick Wolf and Danielle Gelber, who works for Dick. They had talked to NBC, with the new regime coming in, and said that they wanted to do a show about firemen. So, we got a phone call from them saying, “Would you guys be interested?,” and we leapt at the chance. We thought Chicago would be a great city to set it in, since Rescue Me had been done in New York, and Chicago was born out of this great fire. So, we said, “Put us on a plane to Chicago and let us research.” We spent three weeks in fire houses in Chicago, and then wrote the show.
Source and more: Collider
