Fern is a Democratic member of Montana House of Representatives for District 5.
Fern has served on the Whitefish School District board of trustees.
[1] On November 8, 2016, Fern won the election and became a Democratic member of Montana House of Representatives for District 5.
Fern defeated Chet Billi with 56.74% of the votes.
[2][3] On November 6, 2018, as an incumbent, Fern won the election and continued serving District 5.