In 2003, he appeared in the feature film Grind and a music video for a song called "Too Bad About Your Girl" by The Donnas.
After a year of training and auditioning, Brody landed the role of Barry Williams in the television movie Growing Up Brady (2000).
He also appeared in the Canadian comedy television series The Sausage Factory.
In 2001, he played a minor role in American Pie 2, named as "high school guy".
Brody's major role in a television series came in 2002, when he was cast in a recurring role on Gilmore Girls as Dave Rygalski, Lane's bandmate and love interest.
1 in UK Cosmo GIRL as pin-up sex-symbol beating out Johnny Depp in 2005, chosen as one of the People Magazine Sexiest Man Alive in 2004–2006 and posed on the cover of mainstream magazines, including GQ, Nylon Guys, Entertainment Weekly, Teen Vogue, and TV Guide.
Brody was the first male on the cover of Elle Girl.In 2005, Brody appeared in a supporting role alongside Angelina Jolie and Brad Pitt in the film Mr. Smith, and played a Hollywood studio assistant in the film adaptation of Thank You for Smoking (2006).His next film role was in a romantic comedy entitled In the Land of Women (2007), starring Meg Ryan and Kristen Stewart.Brody plays a writer who returns to his mother's Michigan hometown in order to take care of his sick grandmother.Brody did not have to audition for the part, but was almost unable to appear in the film because of scheduling conflicts with the second season of The O.C.; the film's director pushed filming back eight months because he wanted Brody to star.