Cox was born to a British father and an Irish mother in Vienna. Her parents later divorced. Both of them are pianists, who originally came to Vienna on a grant for musicians. Cox grew up in Vienna and graduated from high school in 2003. She developed an interest in acting after performing in a play as part of her English classes during her final year in high school. After her graduation she went on to study acting at the Max Reinhardt Seminar. In 2008 she was under contract as a stage actor at the Theater in der Josefstadt in Vienna. In 2011 Cox moved to Berlin and since then she has appeared in various movies and series on German and Austrian TV, among them several Tatort movies. Since 2015 she plays the role of the viking woman Brida in the TV series The Last Kingdom, which made her known to international audiences.
The Last Kingdom: Seven Kings Must Die
(Brida)
Rammbock: Berlin Undead
(Anita)
Kleine Eheverbrechen
(Lisa Sobiri)
The Fatherless
(Mizzi)
How to Live Your Life
(Laura)
Dutschke
(Gretchen Dutschke-Klotz)
Killerjagd - Schrei wenn du dich traust
(Maja Hönow)
Unschuldig - Der Fall Julia B.
(Julia Brandt)
Alma and Oskar
(Alma Mahler)
Molly & Mops - Ein Mops kommt selten allein
(Kellnerin)
Steirerstern
(Jana Skoff)
Stille
(Mel)
The Vicar's Wife
(Deirdre Lawless)
Die Freischwimmerin
(Martha Müller)
Unsichtbarer Angreifer
(Emma Turgut)
Der Täter
(Jakobs Tochter Mascha)
The Dead and the Living
(Agnes, junge Frau in Auschwitz)
Nichts zu verlieren
(Miriam)
Jesus Cries
(Magdalena)
Futuro Beach
(Nanna)
Die Tänzerin - Lebe deinen Traum
(Milena 'Milli' Neubert)
Wuff
(Ella)
Head Full of Honey
(Nursing Home Manager)
The Accidental Rebel
(Lilly)
What Have We Done to Deserve This?
(Therapist)
Danowski - Blutapfel
(Meta Jurkschat)
A Royal Affair
(Caroline Mathilde)
Blind ermittelt: Zerstörte Träume
Hartwig Seeler – Ein neues Leben
(Tascha)
The Salvation Of The World As We Know It
(Katharina)
The Physician II
(Mercia)
CopStories
(Sonja Omminger)
Polizeiruf 110
(Heike)
Kommissarin Lucas
(Jeanette Wilson)
Scene of the Crime
(Miranda Kador)
The Last Kingdom
(Brida)
Scene of the Crime
(Roswita Mader)
37 Sekunden
(Clara Andersen)
jerks.
(Self)
Vienna Crime Squad
(Judith Stoll)
SOKO Stuttgart
(Lucie Thieme)
SOKO Leipzig
(Hannah Falck)
Shades of Guilt
(Ulrike Gronau)
Labaule & Erben
A Case For Two
(Edith Egger)
SOKO Kitzbühel
(Gina Prinz)
Kurzstrecke mit Pierre M. Krause
Schnell ermittelt
(Diana Weininger)
Paul Kemp - Alles kein Problem
(Manuela)
Scene of the Crime
(Sybille Wildering)
Constellation
(Sara Schiller)
Murder Mindfully
(Katharina Diemel)
Wer weiß denn sowas?
(Self - Guest)
Zorn
(Frieda Borck (Folge 1))
ZIBB
(Self)