Background
Jahnke was born on April 20, 1900 in the Town of Marquette, Wisconsin.
Jahnke was born on April 20, 1900 in the Town of Marquette, Wisconsin.
He would become a dairy farmer. Additionally, he was Chairman of the Town of Marquette from 1933 to 1964 and of the Green Lake County, Wisconsin Board from 1944 to 1965. He was a Republican.
Jahnke was a member of the Assembly from 1957 to 1968.