He also wrote, produced and featured in an MTV pilot The Dustin and Justin Show.
Actress Ashley Olsen is reportedly dating National Treasure star Justin Bartha - after they were spotted enjoying a night out together in Las Vegas.
He also appeared as Doug Billings in another box-office hit trilogy.
Bartha has recorded several credits on the small screen including the sitcom Teachers and the comedy series The New Normal both on the NBC.
He also took some time off acting to perform some behind-the-scenes roles afterwards.
He worked as a production assistant on the 1999 film Analyze This after which he wrote, produced and directed the short film Highs and Lows (2003).