Eysteinn Sigurðarson (Sigurdarson) was born in Reykjavík, Iceland, and was raised in Madison, Wisconsin, United States.
[1] He attended the University of Wisconsin where he studied English and Creative Writing, before deciding to go into the performing arts.
[2] As a student he performed at the Reykjavík City Theatre on many reproductions of plays including Pippi Longstocking, Who's Afraid of Virginia Woolf?
[4][1] In 2020, Sigurðarson played a main role of Sigtryggr the Danish warlord, in season 4 and 5 of The Last Kingdom (TV series).
[5] Eysteinn Sigurðarson is currently living in London, United Kingdom, and is in a relationship with fellow actress Salome Gunnarsdóttir, whom he met at the Iceland University of the Arts, in Reykjavík.