Career
He has done the voices for several Swedish language dubbed versions of movies and cartoons, including the voice of Charlie Brown. Leo Hallerstam is son to the actor Staffan Hallerstam. He played the role of a troubled teenager in the 2004 film Mission Sweden.
He played the role of an autistic boy in a 2002 episode of the Swedish Beck – Pojken i glaskulan.
Dubbed Recess () as Mikey Blumberg Snoopy as Charlie Brown Mary Poppins as Michael Banks The Iron Giant as Hogarth Hughes Harry Potter as Fred and George Weasley.