My father woekrd his entire professional career at Chicago's natural gas utility, which then was called People's Gas, Light, and Coke. (It's now called Nicor, and has had some other names in the interim.) He was a sort of senior field engineer, and woekrd as a technical liaison between the utility and industrial customers erecting or upgrading large facilities using natural gas. He helped make sure that architects who were designing new facilities built adequate infrastructure for natural gas and understood the challenges. (Not all architects did back then, and perhaps don't to this day.) His biggest single project was O'Hare Field, which took most of his efforts for eight or ten years. He was an interesting cross between an undersocialized engineering geek and a smooth-talking troubleshooter, and I think that one of his greatest skills was defusing conflict and getting oversized and excessively tender egos to work productively together on large and complicated projects.Weird sidenote: The focus of his work at O'Hare was their big boiler plant, which you see to your right just after leaving the terminal area on I-190. Twenty years after he died, I was plotting the location of his great-grandfather's farm on a map, and I realized that the old Duntemann farmhouse was smack in the middle of the boiler plant. As best I can tell, he never knew that. (The farm had been sold to a golf course developer and razed in 1921, a year before he was born.)