He was a member of the Wisconsin State Assembly from 1911 to 1913 and judge of the Milwaukee County Civil Court from 1924 to his death in 1927.
[2][4][citation needed] In 1908, Mahon moved to Eland, Shawano County, Wisconsin where he practiced law.
[2][1] While practicing law in Eland, Mahon represented Shawano County in the Wisconsin State Assembly from 1911 to 1913 and was a Republican.
[3] On June 2, 1924, Mahon was appointed to Branch 7 of the Milwaukee County Civil Court, succeeding Otto H.
[7] Mahon died as a result of a relapse of a nervous and physical breakdown on September 24, 1927, in Milwaukee, Wisconsin.