Gunderson owned a RadioShack store, bail bondsman service, and a storage unit business in Libby, Montana.
[4] Gunderson is the cofounder of Montanore Positive Action Committee, an advocacy group.
[4] On November 8, 2016, Gunderson won the election and became a Republican member of Montana House of Representatives for District 1.
[5] On November 6, 2018, as an incumbent, Gunderson won the election and continued serving District 1.
[6][2] Gunderson is also a member of the Libby Asbestos Superfund Advisory Team.