He was a White House intern in the Office of the Vice President in 2006.[5] For a time, Demmer was Director of Innovation & Strategy at KSB Hospital. From 2008 to 2012, he was a member of the Lee County Board.[5]
In 2023, he became Executive Director of the Lee County Industrial Development Association. The Lee County Industrial Development Association is a not-for-profit organization whose mission is to promote, develop, and facilitate industrial, commercial, and business enterprises in Lee County[6]
Illinois House of Representatives
Demmer was a top Illinois House Republican[7] who served as Deputy Republican Leader from 2018 to 2023.[8] Demmer was the chief budget negotiator for the Illinois House Republicans,[9] and was the caucus leader on Medicaid and healthcare policy issues.[10]
Previously, Demmer was Republican Conference Chairman from January 2017 to July 2018.[11] He was a member of the Joint Committee on Administrative Rules from 2016 to 2023.[12]
Demmer was the Republican Spokesperson[13] on the Special Investigating Committee II in 2020 to investigate the conduct of Michael Madigan, the then-Speaker of the Illinois House of Representatives, who was later indicted by a federal grand jury on 22 counts of racketeering and bribery in connection with alleged corruption schemes.[14]
^Veeneman, Drew (June 20, 2011). "90th House District"(PDF). precinctmaps.com. Archived from the original(PDF) on November 3, 2012. Retrieved December 31, 2012.