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He was born in New York City, the son of Lisa , a former actress who also ran an acting school, and Patrick O'Brien, a camera operator. He grew up in New Jersey, until the age of twelve, when he and his family moved to California.
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After graduating from Mira Costa High School in 2009, he considered pursuing sports broadcasting and possibly working for the New York Mets. At 14, O'Brien began posting original videos onto his YouTube channel. With the videos a local producer and director approached him about doing work for a web series while in his senior year of high school. He had planned to attend Syracuse University as a sports broadcasting major, but decided to pursue an acting career.
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He went through several auditions before getting one of the main roles in MTV's Teen Wolf. In 2010, he began playing Stiles in the series.
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In 2011, O'Brien was introduced to audiences in the entirely improvised independent comedy film High Road. The following year, he starred opposite Britt Robertson in the romantic comedy The First Time
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O'Brien is in a relationship with actress Britt Robertson, whom he met in 2011 while filming The First Time
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He played the role of Charlie Brown
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Role: Jimmy
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Role: Stiles Stilinski
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Role: Dave Hodgman
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O'Brien played Thomas in the lead role in The Maze Runner, a film adaptation of the novel of the same name, which began filming in summer 2013.
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Role: Stuart Twombly
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Role: Peter
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Role: The Guy
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Young Hollywood Awards (2013) W
Giffoni Film Festival (2014) W
NewNowNext Awards (2014) N
Teen Choice Awards (2014) W
Young Hollywood Awards (2014) W
Melty Future Awards (2015) W
MTV Movie Awards (2015) 3 W and N
Teen Choice Awards (2015) 2 N and W
Teen Choice Awards (2016) 4 W
Teen Choice Awards (2017) W and N -
Role: Thomas
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Role: Thomas
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Role: Caleb Holloway
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Role: Mitch Rapp
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Role. Thomas
