Justin Bartha is an American film and television actor best known for his role in The Hangover film series and the popular sitcom The New Normal. He worked as a production assistant before making his debut with the drama movie 54 (1998). His other notable movies include National Treasure (2004), The Hangover (2009), The Hangover Part II (2011) and Sticky Notes (2016). His 2019 release includes Against The Clock.