After graduating from McFarland high school in 1998, Spencer enlisted in the Air Force for four years and was stationed at Offutt Air Force Base in Nebraska. On duty during the 9/11 terrorist attacks, Zimmerman received the Joint Service Achievement Medal for meritorious service. During his time in the military Zimmerman obtained a CDL driving semi for a mobile unit and graduated from the Community College of the Air Force with a degree in Information Systems Technology. After an honorable discharge Spencer obtained a B.S. in Business Administration from Edgewood College. He has worked as a tanker truck driver for an agricultural cooperative and as a chauffeur for Presidential Transportation Service and is employed as a Signature Line Service Technician refueling aircraft at Chicago Executive Airport in Wheeling, Illinois. Zimmerman is a recipient of the Lyman Anderson Award for public service, rated highest with the NRA, and was endorsed by Pro-Life Wisconsin.