Kinnaman began his acting career as a child actor in Swedish soap opera Storstad (1990). His older sister was dating one of the show’s directors, and he asked Kinnaman to audition for a part on the show. After portraying Felix Lundström in 22 episodes, he stepped away from acting.
Kinnaman restarted his acting career in 2002. While studying at drama school, Kinnaman featured in several films such as Hannah med H and God Save the King (Swedish: Tjenare kungen). He also worked on productions staged at the Backa Theatre in Gothenburg. He graduated from Malmö Theatre Academy in 2007 and started working at the Gothenburg City Theatre. In the same year, he attracted the attention of Swedish media with the role of Raskolnikov in a stage adaptation of Crime and Punishment. In 2009, he starred in the film In Your Veins (Swedish: I skuggan av värmen) and played the role of a police informant in six films of the Johan Falk film series. He was cast in the film Easy Money (released January 2010), which brought him mainstream attention in Sweden and at the international film market, and also earned him a Guldbagge Award in the Best Actor category.
Looking to expand his acting career, Kinnaman hired an agent in the United States. It was announced in the spring of 2010 that he would be making his international film debut in the thriller The Darkest Hour, which began filming in Moscow in June 2010 and was released in December 2011. Between April 2011 and August 2014, Kinnaman had a four-season starring role as Detective Stephen Holder in the AMC television series The Killing, based on the Danish television series Forbrydelsen. Kinnaman was one of the contenders for the lead roles in Thor (2011) and Mad Max: Fury Road (2015). Although Kinnaman said that he is eager to work and become recognized in the U.S., he added that “I absolutely don’t feel that I have to take any role that I can get just because it is the United States. I’m looking for something interesting, I’m still young in my artistry, and I must dare to do things even when there’s a risk for failure”.
In 2012, Kinnaman reunited with Easy Money director Daniel Espinosa in the latter’s Hollywood debut, Safe House, and also starred in the indie film Lola Versus. On 3 March 2012, it was confirmed that Kinnaman would play the lead role of Alex James Murphy/RoboCop in the remake of 1987’s RoboCop. The film was released in February 2014. In 2015, he starred in the action thriller Run All Night and mystery drama Child 44.
In 2016, Kinnaman played Rick Flag in the Warner Bros. film adaptation of DC Comics anti-hero team Suicide Squad, directed by David Ayer. He reprised his role as Rick Flag in its 2021 sequel/soft reboot, The Suicide Squad, directed by James Gunn. He also starred in the independent drama-thriller film Edge of Winter, in which he plays Elliot Baker, a father of two who takes his children on a shooting trip that goes wrong. The film was released on demand on 27 July 2016, and in select theaters on 12 August 2016.
Between 2016 and 2019, Kinnaman worked on 4 different original productions of streaming television networks such as Netflix, Amazon Prime Video and Apple TV+. Kinnaman played Governor Will Conway in Seasons 4 and 5 of the U.S. version of House of Cards on the streaming service Netflix, and the protagonist Takeshi Kovacs in Netflix’s Altered Carbon, an adaption of Richard K. Morgan’s hardboiled cyberpunk science fiction novel of the same name. Also in 2019, Kinnaman starred as Erik in the Amazon Prime Video series Hanna, an adaptation of the 2011 action film of the same name. Since 2019, Kinnaman starred as NASA astronaut Ed Baldwin in the Apple TV+ original science fiction space drama series For All Mankind.
In 2019, Kinnaman played Pete Koslow in Andrea Di Stefano’s action thriller film The Informer. In 2020, Kinnaman starred as Thomas Steinman in Yuval Adler’s post-war thriller The Secrets We Keep. Kinnaman also starred in Jérémie Guez’s crime drama Brothers by Blood which was released in the United States in 2021. In January 2021, it was announced that Kinnaman was cast in Season 4 of the In Treatment reboot at HBO. He will star as Adam, the on and off boyfriend of the main character Dr. Brooke Taylor (played by Uzo Aduba). He also reprised his role as Ed Baldwin in Season 2 of For All Mankind, which aired in 2021.
Between 2022 and 2023, Kinnaman reprised his role as Ed Baldwin in Season 3 of For All Mankind and once again for Season 4, airing in 2022 and 2023 respectively.
