Jonathan Gardner Callahan was an American politician. He was member of the Wisconsin State Assembly.The United States Biographical Dictionary and Portrait Gallery of Eminent and Self-made Men: Wisconsin Volume, Volume 1, American Biographical Publishing Company, 1877, Jonathan G. Callahan, Retrieved January 24, 2016
Biography Callahan was born on November 2, 1823, in Andover, Massachusetts. He attended Phillips Academy. A Presbyterian, Callahan married Maria S. Johns on April 19, 1849. They had two children.
Career Callahan was a member of the Assembly during the 1875 session. Additionally, he was President (similar to Mayor) of Eau Claire, Wisconsin. He was a Republican.
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