Actor
Mark Sheppard
Born 1964 · London, England, UK
Mark Andreas Sheppard (born 30 May 1964) is a British actor and musician. He is often credited as Mark A. Sheppard. Sheppard is known for playing the demon/King of Hell Crowley on Supernatural and for his recurring roles as lawyer Romo Lampkin on the Battlestar Galactica reboot, Interpol investigator James Sterling on Leverage, and small-time crime lord Badger on Joss Whedon's Firefly. Description above from the Wikipedia article Mark Sheppard, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Acting
Supernatural
Crowley · 2005
The X-Files
Bob the Caretaker / Cecil L'Ively · 1993
Firefly
Badger · 2002
Charmed
Arnon · 1998
Doctor Who
Canton Delaware · 2005
Battlestar Galactica
Romo Lampkin · 2004
White Collar
Curtis Hagen · 2009
In the Name of the Father
Paddy Armstrong · 1993
NCIS
Young Mr. Pain (uncredited) · 2003
24
Ivan Erwich · 2001
Monk
Chris Downey · 2002
CSI: Crime Scene Investigation
Rod Darling · 2000
Chuck
Ring Director · 2007
Doom Patrol
Willoughby Kipling · 2019
Star Trek: Voyager
Leucon · 1995
Warehouse 13
Benedict Valda · 2009
MacGyver
Fake Dr. Zito · 2016
Burn Notice
Tom Prescott · 2007
Medium
Charles Walker · 2005
Sliders
Jack · 1995
Secret Level
Astropath / Ultramarines Orbital Command (voice) · 2024
Leverage
Jim Sterling · 2008
Dollhouse
Tanaka · 2009
Without a Trace
Johnny Patani · 2002