Filmography
| 2019 | A Dog's Journey · as Henry Montgomery |
| 2018 | The Conners · as David HealyNa Plexu |
| 2017 | Rings · as Gabriel Brown |
| 2016 | The Cleanse · as Paul Berger |
| 2016 | For the Love of Spock · as Leonard Hofstadter |
| 2013 | CBGB · as Terry OrkNa Plexu |
| 2011 | In Time · as Borel |
| 2009 | Table for Three · as TedNa Plexu |
| 2008 | Hancock · as Jeremy |
| 2007 | The Big Bang Theory · as Leonard Hofstadter |
| 2006 | My Boys · as Trouty |
| 2006 | Unaired Pilot · as Leonard Hofstadter |
| 2005 | My Name Is Earl · as Scott |
| 2005 | Happy Endings · as Miles (uncredited) |
| 2005 | American Dad! · as Arnie (voice) |
| 2005 | Peep Show · as Mark |
| 2004 | LAX · as Leland Pressman |
| 2004 | Chrystal · as Barry |
| 2003 | Hope & Faith · as Jay |
| 2003 | Bookies · as JudeNa Plexu |
| 2001 | Vanilla Sky · as Peter Brown |
| 2000 | Morgan's Ferry · as Darcy |
| 2000 | Bounce · as Seth |
| 2000 | Playing Mona Lisa · as Arthur |
| 1999 | The Norm Show · as Dale Stackhouse |
| 1999 | Family Guy · as Leonard Hofstadter (voice) |
| 1999 | Batman Beyond · as Knux (voice) |
| 1998 | The Opposite of Sex · as Jason Bock |
| 1997 | I Know What You Did Last Summer · as Max Neurick |
| 1997 | Suicide Kings · as Ira RederNa Plexu |
| 1997 | Bean · as Stingo Wheelie |
| 1996 | Murder at My Door · as Teddy Mcnair |
| 1994 | Without Consent · as MartyNa Plexu |
| 1993 | Sudden Fury · as Daniel HanniganNa Plexu |
| 1992 | Billy · as David Macgregor |
| 1991 | Civil Wars · as Greg Stolbach |
| 1991 | Backfield in Motion · as Tim SeaversNa Plexu |
| 1990 | In Defense of a Married Man · as Eric |
| 1990 | American Dreamer · as Danny Nash |
| 1990 | Blossom · as Jason |
| 1990 | Blind Faith · as John Marshall |
| 1989 | Christmas Vacation · as Rusty Griswold |
| 1989 | Prancer · as Billy Quinn |
| 1989 | |
| 1988 | Roseanne · as David Healy |
| 1988 | A Night in the Life of Jimmy Reardon · as Toby Reardon |
| 1987 | Murder Ordained · as Doug Rule |
| 2018 | SciJinks · as Executive Producer |
| 2018 | Living Biblically · as Executive Producer |
| 2016 |