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While shooting for Everwood, Greg used to share a house with fellow co-actors Treat Williams and Tom Amandes.
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For the movie Kids In America, Greg had to kiss Stephanie Sherrin for six minutes non-stop for a scene.
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In order to prepare for his role in Everwood, Greg watched movies like Varsity Blues to get a feel of American teenagers.
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Greg used to wrestle in high school.
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Greg is very good friends with his Everwood co-star Emily VanCamp.
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Greg loves Italian food. One of his favorite eating places include In And Out Burgers.
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Greg's favorite brand is Nike.
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Greg is an executive producer of The U, a series of DVDs that explores college life from a student's perspective on campuses across the U.S.
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Greg has appeared on the cover of the magazine named Satellite Direct dated September 2002. He has also been featured in magazines like TV Guide, Entertainment Weekly and Vancouver Prince.
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Greg's first on-screen kiss was with Kirsten Dunst in the movie Small Soldiers.
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Awards:
- In the year 1997, Greg was presented with the UNICEF Award at the Berlin Film Festival.
- In 2002, Greg won the Young Hollywood Award as the "One to Watch."
- In 1998, Greg was presented with a Young Artist Award as the "Leading Young Actor" for his performance in Shadow Zone: My Teacher Ate My Homework.
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Greg auditioned for the role of Ephram Brown, in Everwood, five times.
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Greg wears contacts.
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Greg does not own a television. He feels his free time is better spent being creative.
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Greg and his brother, Douglas, both auditioned for the role of Ephram Brown on Everwood.
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Greg co-owns a production company--Braveart--with Susan Johnson.
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Gregory is a dual citizen of the United States and Canada.
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Gregory's first on-screen kiss was with Kirsten Dunst in Small Soldiers.
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Greg is 5 feet 10.5 inches (1.79 metres) tall.
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Gregory brought his brother with him to the Kids in America premiere party.
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Though he tries his best to eat healthy, Gregory has a self-admitted addiction to Famous Amos cookies.
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Greg broke his collar bone when he was skiing.
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Greg's hobbies include rock climbing, soccer, rollerblading, and photography.
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Greg has three siblings: Andrew, Samantha and Douglas. Greg is the oldest.
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During the making of American Outlaws, Greg was nicknamed "Secret Weapon" for his talent handling guns.
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Greg is allergic to cats.
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Greg was in a Tide commercial when he was 14 months old.