Background
Born in North Branch, Minnesota, Duffy grew up in Hollandtown, Wisconsin and graduated from Kaukauna High School.
Born in North Branch, Minnesota, Duffy grew up in Hollandtown, Wisconsin and graduated from Kaukauna High School.
He graduated from Saint Norbert College and received his law degree from the University of Wisconsin Law School.
He served in the United States Army Air Forces during World World War World War II He then practiced law in Green Bay, Wisconsin. He served in the Wisconsin State Assembly from 1949 to 1950 as a Democrat. Duffy was elected a Wisconsin Circuit Court judge for Brown County, Wisconsin serving until his retirement in 1992.
He died in Green Bay, Wisconsin.