Career
Born in Naumberg, Saxony, Germany, Dennhardt emigrated to the United States and settled in Wisconsin as a young manitoba He was in the implement business and was an auctioneer. Dennhardt served in the Wisconsin State Assembly in 1911 and was a Republican.
He then served in the Wisconsin State Senate in 1919.
In 1922, Dennhardt served as mayor of Neenah, Wisconsin. Dennhardt died of a stroke in Neenah, Wisconsin.
