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Dan O'Brien (XXI)

Dan O'Brien is known for his work on Grand Theft Auto IV (2008), Grey's Anatomy (2005) and How I Met Your Mother (2005). See full bio »

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Known For

Grand Theft Auto IV
Grand Theft Auto IV Jay Hamilton
Grey's Anatomy
Grey's Anatomy Keith Gardner
How I Met Your Mother
Being Bin Laden
Being Bin Laden Al-Zawahiri


Hide Hide Show Show Actor (21 credits)
 2018/II Occupant (Short) (post-production)
 2018 Pandas in New York (TV Movie) (post-production)
  Maybe There's a Tree (completed)
Audience Member
 2018 Brand New Old Love
 2018 The Affair (TV Series)
- Episode #4.8 (2018) ... Seth
 2017/II The Talk (Short)
 2017 Ray Donovan (TV Series)
 2016 Prosperity Lane (TV Movie)
Garfunkel Blakely
 2015 Grey's Anatomy (TV Series)
Keith Gardner
- You're My Home (2015) ... Keith Gardner
- Time Stops (2015) ... Keith Gardner
 2015 Cain Enabled (TV Series)
- Smart Money, Dumb Money (2015) ... Bill
 2015/I Astraea
 2011-2013 Whitney (TV Series)
- Cake, Cake, Cake (2013) ... Mark
- Alex, Meet Lily (2013) ... Mark
- Crazy, Stupid, Words (2013) ... Mark
- Nesting (2013) ... Mark
- Lost in Transition (2013) ... Mark
 2011 The Delray Story (Short)
Delray (as Daniel G. O'Brien)
 2011 Being Bin Laden
Al-Zawahiri (as Daniel G. O'Brien)
 2011 How I Met Your Mother (TV Series)
- Garbage Island (2011) ... Meeker (as Daniel G. O'Brien)
 2010 Delocated (TV Series)
- Tap (2010) ... Lon
 2010 Romantically Challenged (TV Series)
- The Charade (2010) ... Neil (as Daniel G. O'Brien)
 2010 Below the Beltway
Scott (as Daniel G. O'Brien)
 2008 Grand Theft Auto IV (Video Game)
Jay Hamilton (voice, as Daniel G. O'Brien)
 2007 Spinning Into Butter
Townie #1 (uncredited)
 2006 Law & Order (TV Series)
- Hindsight (2006) ... Delray (as Daniel G. O'Brien)
Show Show Miscellaneous Crew (1 credit)
Show Show Self (1 credit)

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Personal Details

Alternate Names:

Daniel G. O'Brien

Did You Know?


He graduated from the University of Notre Dame in 1999.

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