Heiskanen received her breakthrough role in the 1991 Swedish film Il Capitano: A Swedish Requiem directed by Jan Troell.
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She played in Kungliga Dramatiska Teatern and in Riksteatern where she for example performed the role of Masja in Anton Chekhovs The Seagull (2008) directed by Lars Norén.
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In 2008, Heiskanen starred in the leading role of Jan Troell's Everlasting Moments, for which she won the Guldbagge Award for Best Actress and the Best Actress Award from Valladolid International Film Festival.
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