Cast & creator
Dan O'Brien
Best known for Grey's Anatomy, Law & Order, How I Met Your Mother
Dan O'Brien is an actor, known for Whitney (2011), Grand Theft Auto IV (2008) and The Delray Story (2011). He graduated from the University of Notre Dame in 1999.
Also known as: Daniel G. O'Brien
Movies
6
film credits
Series
6
television credits
Career
12
1990–2025 · acting roles
Credit score
6.3
average across scored titles
Signature credits
Known for
Across film & television
Filmography (12)
Showing 12 of 12 credits
Series
★ 8.2
Grey's Anatomy
Keith Gardner
2005
Series
★ 7.3
Law & Order
Delray
1990
Series
★ 8.1
How I Met Your Mother
Meeker
2005
Series
★ 7.7
American Housewife
Daniel
2016
Series
★ 6.7
The Affair
Seth
2014
Series
★ 5.2
Whitney
Mark
2011
Movie
★ 6.1
Gunslingers
Josh
2025
Movie
★ 5.7
Descendent
Christian
2025
Movie
★ 3.9
Brand New Old Love
Thom
2017
Movie
★ 6.0
Astraea
James
2015
Movie
★ 6.0
Occupant
Frank
2018T
Movie
★ 5.0
The Delray Story
Delray