[2] Heintzeman served as the Thirty Lakes Watershed District Manager and is a member of the Brainerd Chamber of Commerce.

[9][10] Heintzeman offered an amendment to a 2020 bonding bill that would block efforts to challenge the Enbridge Line 3 pipeline project.

[12][13] Heintzeman has opposed state efforts to regulate PFAS chemicals, arguing action should be addressed at the federal level.

[20] Heintzeman signed on to a letter calling on the University of Minnesota to stop participating in research on "aborted human fetal organs".

[21] In 2020, he was targeted by activist Ben Dorr, who posted a video clip confronting Heintzeman with his six-year-old son for allegedly "voting to kill babies".