[2] Richardson's first screen work was in New York in 2000, appearing in one episode each of Strangers with Candy and Law & Order.
[2] His first role was that year, in a two episode run as Keri Russell's love interest of the week, late in the final season of Felicity.
[2] He subsequently co-starred in the prequel to the Dumb and Dumber franchise Dumb and Dumberer: When Harry Met Lloyd as a younger version of Jeff Daniels' character, Harry Dunne.
Richardson starred as one of the leads in the horror film Hostel, earning a 2006 MTV Movie Award nomination for "Best Frightened Performance".
In 2006, he began starring as Patrick Bachelor in the series Men in Trees.