An outstanding athlete at White Lake High School, he went on to graduate from Dakota State University. While in college he developed a love of coaching while serving as a student assistant under longtime Trojans coach Ed Harter.
Munsen began his career in education at Marion. He then moved to Mitchell and coached the Kernel boys from 1974-2012. During that time Mitchell won nine state championships. Munsen’s career record as a boys coach was 672-254.
The Kernels also won three additional state titles while Munsen was serving as girls coach from 1989-2001. His record with the Mitchell girls was 230-71.
With a combined boys and girls record of 902-325, Munsen was the overall winningest coach in state history. His 12 combined state championships is also a state record. Munsen guided the Kernel boys to 18 Eastern South Dakota Conference titles while his Mitchell girls teams won seven ESD championships.