[1] Janssen graduated from Hooper Public School.
He was formerly the president of both Nickerson and Logan View school boards and is currently a member of the Nickerson volunteer fire department, Lions Club, and Hooper Commercial Club.
[1] Janssen was elected in 1992 to represent the 15th Nebraska legislative district.
He sat on the Revenue, Urban Affairs, and Building Maintenance committees and chaired the Revenue committee.
[1] In 2009, he was succeeded in the Legislature by his nephew, Charlie Janssen, who was elected to the 15th district seat in 2008.