Doyle was a native of Sioux City, Iowa, born to parents William and Nellie, née Sparby, on January 13, 1925.
He graduated from Sioux City Central High School and served in the United States Army Air Corps during World War II.
He earned his bachelor's degree from Morningside College and pursued legal studies at the University of South Dakota School of Law, completing his juris doctor degree at Morningside.
[1][2] Doyle represented Woodbury County in the Iowa General Assembly from 1957 to 1993 as a Democrat.
In the 1980 election cycle, Doyle won the 26th district seat on the Iowa Senate.