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He is an only child.
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Erik was the star of Starsnorths' short film Once Not Far From Home (2003).
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Erik attends a regular school when he is at home, and a tutor teaches him when he is working.
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He is an avid reader and has a special interest to all literature relating to World War II.
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He has a frog named Bubbles, two fishes named Justin and Sushi and a dog named Schnuppi. The dog is named after Charlie Brown's dog, Snoopy.
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Now he lives in Franklin, Massachusetts.
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Erik loves to ski, boogy board, build obstacle courses, play games of paintball, and travel by the world.
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He is learning japanese.
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Erik's father is called Fred Sullivan.
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He acted in the movie Armageddon (1998) as the kid with rocket ship (uncredited).
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He acted in the film The Cider House Rules (1999) as "Fuzzy".
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Erik acted in the film Wendigo (2001) as "Miles".
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He acted in the movie Unfaithful (2002) as "Charlie Sumner".
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Erik is a volunteer with the American Stroke Association since his father suffered two strokes in July 2003.
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Erik plays piano and altosaxofone.
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He was the voice of the little seahorse, "Sheldon", in the Disney and Pixar film Finding Nemo.
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He appeared in the movie Joe Dirt as "Young Joe Dirt".
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Awards he won:
Teen Choice Award
2003-Choice TV Sidekick
for: Malcolm in the Middle
2001 Best Ensemble in a TV Series
for: Malcolm in the Middle
2002 Best Ensemble in a TV Series for: Malcolm in the Middle
YoungStar Awards
2000 Best Young Ensemble Cast - Television
for: Malcolm in the Middle
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Erik's father is the owner of a restaurant in Massachusetts called The Alamo.
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Erik can speak Swedish fluently.