[1] He is mostly known for the role of Ivar the Boneless in the historical drama television series Vikings (2016–2020).

[4] At the age of 17, Andersen decided he wanted to learn to act in front of a camera, and he went on to do Film and Media Studies at the University of Copenhagen (2014–2015).

[5] In 2022, he played Claus Malmqvist in the miniseries The Viking - Downfall of a Drug Lord.

[5] In 2024, he played Emil Veggem in season 2 of the British television series Granite Harbour, and in the same year, played Emil Anderson in six episodes of the Viaplay Danish comedy-drama series Call me Dad.

[5] In his free time, Andersen is a keen photographer;[4] he is visually-minded, and is constantly learning about cameras during his experience in the film industry.