While shooting for Everwood, Greg used to share a house with fellow co-actors Treat Williams and Tom Amandes.
For the movie Kids In America, Greg had to kiss Stephanie Sherrin for six minutes non-stop for a scene.
In order to prepare for his role in Everwood, Greg watched movies like Varsity Blues to get a feel of American teenagers.
Greg used to wrestle in high school.
Greg is very good friends with his Everwood co-star Emily VanCamp.
Greg loves Italian food. One of his favorite eating places include In And Out Burgers.
Greg's favorite brand is Nike.
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.
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.
Greg's first on-screen kiss was with Kirsten Dunst in the movie Small Soldiers.
- 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.
Greg auditioned for the role of Ephram Brown, in Everwood, five times.
Greg wears contacts.
Greg does not own a television. He feels his free time is better spent being creative.
Greg and his brother, Douglas, both auditioned for the role of Ephram Brown on Everwood.
Greg co-owns a production company--Braveart--with Susan Johnson.
Gregory is a dual citizen of the United States and Canada.
Gregory's first on-screen kiss was with Kirsten Dunst in Small Soldiers.
Greg is 5 feet 10.5 inches (1.79 metres) tall.
Gregory brought his brother with him to the Kids in America premiere party.
Though he tries his best to eat healthy, Gregory has a self-admitted addiction to Famous Amos cookies.
Greg broke his collar bone when he was skiing.
Greg's hobbies include rock climbing, soccer, rollerblading, and photography.
Greg has three siblings: Andrew, Samantha and Douglas. Greg is the oldest.
During the making of American Outlaws, Greg was nicknamed "Secret Weapon" for his talent handling guns.
Greg is allergic to cats.
Greg was in a Tide commercial when he was 14 months old.
Gregory: I am not a morning person. I don't have a cell phone. I don't cook. I drive an old Camaro that I got when I was 16. And I've been known to do stupid things with my time, like Friendster.
Gregory: When I was 14 months old, I was in a Tide detergent commercial. You know the kind, where they show a baby's bottom? But I never saw it.
Gregory: I grew up in Vancouver. I`m a skier. I`ve skied all my life.
Gregory: When it comes to shooting, the hardest part is waking up early.
Gregory: I'm kinda like a big dork, so I'm always using cheesy pickup lines. But if you can make them laugh, well...
Gregory: I just kind of surround myself with stuff. I'll buy a couple things [the character would wear] and I'll start wearing that. In the weeks leading up, I'll start writing things from his point of view and slowly try to find exactly what the voice is, so by the time you're on set, the voice is very natural.
Gregory: I like girls with a sense of humor. You meet people that sometimes you connect with. You have to be attracted to them physically, obviously, but mainly it's if someone gets you or not.
Gregory: Normally I'm kind of a loner, but on Everwood we've all got each other's back.
Gregory: Be yourself and be unique. Don't conform to the people around you.
Gregory: I didn't start off doing my dad's movies or anything. I did it all on my own.
Gregory: (on actress Jennifer Connolly) She's probably, like, the prototypical female. She seems smart. I've never met her, but I'm a big fan. She's got everything sort of tied together nicely.
Gregory: Since Everwood began, I've got a lot more to do but, other than that, I haven't changed. I still prefer to hang out with my friends and joke around. Work is pretty much all consuming, so my love life is kind of non-existent. There's nothing too glamorous about my life.