Canadian-born Seth is probably best known for his supporting role in "The 40 Year Old Virgin" as one of Steve Carell's co-workers who gets him to loosen up. He also had starring roles in "Knocked Up," "Superbad," "Pineapple Express", Observe and Report", "Freaks & Geeks," and "Undeclared." He's appeared in other movies as well, including cult hits "Donnie Darko" and "Anchorman." He's good buddies with director Judd Apatow, who has allowed him to act in several of his films. While they worked on "Undeclared" together, Judd gave him the chance to pen an episode.
Rogen is also set to star in another Apatow film that comes out in the summer 2009 called "Funny People" and he is also working on superhero movie reboot "Green Hornet" and Pegg and Frost comedy "Paul" which are both set to be released in 2010. Paul is a about two geeks who befriend a alien called Paul Seth Rogen will provide the voice work for the alien.