Justin Lee Bartha (born July 21, 1978) is an American actor, writer, and producer, known for his roles as Riley Poole in the National Treasure film series, Doug Billings in The Hangover trilogy, and David Sawyer in the NBC comedy series The New Normal.
Bartha was born in Fort Lauderdale, Florida, and moved to West Bloomfield, Michigan, when he was eight. His father, Stephen, is a real estate developer, while his mother, Betty, is a school teacher. He has one older brother, Jeffrey. Bartha was raised in a Reform Jewish family. After he graduated from West Bloomfield High School in 1996, he moved to New York City and studied filmmaking and theatre at New York University's Tisch School of Arts.