• Can’t Hardly Wait
Jason’s film debut as Matt, The watermelon guy(1998).

• Dead Man on Campus
As Kyle (1998).

• SLC Punk!
As Mike (1998).

• New Jersey Turnpikes
~ (1999).

• Slackers
Co-Staring role As Sam Schechter (2002).

• 11:14
As Leon (2003).

• Certainly Not a Fairytale
Short Film as Leo (2003).

• LolliLove
As Jason (2004).

• The Good Humor Man
As Smelly Bob (2005).

• Bye Bye Benjamin
As Theodore Everest (2006).

• Knocked Up
As Jason (2007).

• Forgetting Sarah Marshall
Written by Jason and Staring as Peter Bretter. (2008).

• I Love You, Man
Co-Star as Sydney Fife (2009).

• Despicable Me
Co-Star as Vector (Voice) (2010).

• Gulliver’s Travels
Co-Star as Horatio (2010).

• Jeff Who Lives At Home
Star as Jeff (2011).

• The Adventurer’s Handbook
Co-Star as Unknown (2011).

• Bad Teacher
Co-Star as Gym Teacher (2012).

• The Greatest Muppet Movie Ever Made
Co-Writer with Nicholas Stoller, Star as Gary (2012).

• Five Year Engagement
Co-Writer with Nicholas Stoller, Male Lead (2011?).

• Freaks and Geeks
Co-Star as Nick Andopolis. Aired between 1999-2000.

• North Hollywood
Un-Aired Pilot written by Judd Apatow from 2001.

• Undeclared
Recurring guest star in 7 episodes as Eric airing between 2001-2002.

• Harry Green and Eugene
Un-Aired Pilot written by J.H. Wyman from 2004.

• CSI: Crime Scene Investigation
Recurring guest star in 3 episodes as Neil Jansen airing between 2004-2005.

• Alias
One episode guest star as Sam Hauser (Season 4 Episode 11 – The Road Home).

• How I Met Your Mother
Co-Star as Marshall Eriksen. Airing between 2005-current.