After high school, he briefly attended General Motors Institute (now Kettering University).

That same year, Neumann enrolled at the University of Wisconsin–Whitewater, where he graduated with honors in 1975, earning a Bachelor of Science in Mathematics.

[5] He started his first company in 1986 in his basement, building homes in the Milton and Janesville, Wisconsin areas.

Shortly after defeating Neumann, Aspin was appointed U.S. Secretary of Defense by President Bill Clinton in 1993.

[7] Just months after being defeated by over 17%, Neumann entered the special election to fill the seat vacated by Aspin.

Neumann was sworn into the 104th United States Congress on January 3, 1995, when the Republican Party gained control of both houses for the first time since the 1950s.

[11] In September 1995, Neumann introduced an amendment requiring congressional approval of troop deployment to Bosnia which failed to pass.

He had considered a run for governor, but did not enter the race in deference to Scott Walker, who withdrew in favor of former Congressman Mark Green.

[22] In 2010 Neumann stated his opposition to same-sex marriage, and claimed that he wanted to focus on jobs and economic development.

[26] After receiving endorsements from conservative groups such as the Club for Growth and Americans For Prosperity, Neumann split the Tea Party vote with millionaire businessman Eric Hovde.