Following his feature debut in The Tribes of Palos Verdes (2017), he portrayed murder victim David Madson in the FX series The Assassination of Gianni Versace: American Crime Story (2018).

In 2021, he guest-starred in the tenth season, subtitled Double Feature as Valiant Thor, and has appeared in two episodes of the spin-off series American Horror Stories.

Fern played the lead role of Albert in the National Theatre of Great Britain's production War Horse,[7][8] which received critical acclaim.

This includes, besides a cash fund, a two-year scholarship at Los Angeles' Stella Adler Academy of Acting and Theatre and mentorship from the father of actor Heath Ledger.

[12] He appeared as Jim Mason in The Tribes of Palos Verdes and wrote, directed and starred in the short film Pisces opposite Keir Gilchrist in 2017.