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At the birth of his son, Charles, in 1843, and for many years, he was County Engineer of Middlesex County, Ontario with responsibility for directing the mapping and planning of county-wide road systems and other engineering and surveying projects.
Dunn was County Engineer at Eldora, Iowa for several years, then served as District Highway Engineer for the State of Iowa at Sioux City, Iowa until 1941, when he entered private practice.
When the planned subway failed to materialize (then-County Engineer Albert S. Porter refused to go forward with the project believing that the future of local transportation was linked to the freeway), Halle's was forced to continue the shuttle service.
Skinner has worked for numerous engineering companies including Ohmeda, Inc., Honeywell, Pillsbury, McDonnell Douglas Corporation and The Architect of the Capitol where he performed testing and development for the space shuttle’s main engine controllers, manufacturing for a flour mill company and designed roadways in Macon County, Alabama where he was an apprentice to Curtis Pierce, the first African American county engineer in Macon County, Alabama.