[5] In 2004, Guttormsgaard and Sarah Cameron Sunde co-founded Oslo Elsewhere, a theatre company known for translating and producing Norwegian playwright Jon Fosse's works in the United States.
[11][12][13] Guttormsgaard also performed in several plays by Fosse, including the U.S. premiere of SA KA LA (2008) and Night Sings Its Songs (2004), both at 45 Bleecker Street Theater in New York City.
[12][14] A review in The New York Times said the cast in Night Sings Its Songs was "uniformly excellent", noting that "Guttormsgaard's [character] smiles when she says awful things" to her husband, played by Louis Cancelmi.
[16] In 2006, she played the main character Rebecca West, the live-in girlfriend of minister John Rosmer (Charles Parnell), for a double-bill staging together with Fosse's deathvariations at the 59E59 Theaters.
[8][16] The New York Times said Rosmersholm was the less successful of the two plays, with Guttormsgaard giving a "quietly realistic performance" but one which failed to convey the "passion and beauty" of the main character.
[16] Another review by nytheatre.com said Guttormsgaard and her co-writers had done a "masterful job of translating the play and adapting it to a more modern setting and sensibility", while acknowledging the challenges inherent in the original work by Ibsen.
[17] Meanwhile, Ibsen News and Comment said, "By far the best of the lot was Anna Guttormsgaard as Rebecca, who overacted a bit but managed her second-act confrontations with Kroll and Rosmer with such power and conviction that one almost forgave her for her work as the translator and adaptor.
In a review for Variety, critic Joe Leydon praised the film as a "solid and satisfying thriller" and "a singularly promising debut for a first-time feature filmmaker", writing, "Gutto demonstrates welcome restraint and a meticulous avoidance of anything that resembles exploitation, relying on indirect yet impactful allusions to keep us constantly aware of the mortal stakes involved.