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|Born||21 May 1957|
When Hallerstam became an adult, he participated in include Gamle Adam and Min käre man at Vasateatern in Stockholm and he participated in Bamse at Fria teatern in Högdalen in Stockholm. Under the 1980s and 1990s Hallerstam dubbed voices in particular Duck Tales, where he dubbed the voices to Huey, Dewey and Louie until Monica Forsberg took over. After that he became a doctor, which he is until present.