In 1816, Child was a representative to the New York State Assembly in Albany. In 1820, he moved to Rochester and opened a store at the Four Corners there. When the Erie Canal was completed, he operated a fleet of canal boats on those waters. He later helped organize and build the Tonawanda Railroad, the first in Rochester. In 1824, he became a trustee of the First Bank of Rochester, and in 1827, became a village trustee.
In June 1834, the Whig majority of the first Rochester city council, selected Child to be the first mayor – Rochester mayors were not elected by popular vote until 1840. He resigned the next spring after newly elected Democrats in the city council authorized granting liquor licenses in Rochester. After his resignation, Child built a mansion on Washington Street in Rochester, and using some of his canal boats, became an early importer of coal.
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