He married Harriet Lavinia Hopkins on September 6, 1831, and they had eight children.[3][4]
Professional life
Mason began his career as an engineer working with his father at the age of 17 on a canal construction project in Albany, New York related to the Erie Canal. He subsequently attended an engineering school in Utica, New York. Mason was the first Chief Engineer of the Illinois Central Railroad.[5]
Mason and his family moved in Chicago in 1865, when he was one of several engineers who worked to reverse the flow of the Chicago River to improve health conditions and the cleanliness of Lake Michigan.[3]
Mason held a high position with the Illinois Central Railroad until he decided to run to be Mayor of Chicago.[6]
Mayoralty
Mason was elected Chicago mayor on a reform ticket in 1869.[6]
Mason was sworn in as mayor on December 6, 1869.[7]
During his administration, the 1871 Great Chicago Fire occurred. Mason responded by directing General Philip Sheridan to place the city under martial law. To date he is the last non Republican or Democratic Mayor of Chicago.
Mason's tenure as mayor ended on December 4, 1871, when he was succeeded by Joseph Medill.[8]