
Acting
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.

Sons of Liberty
as Ackley

Doctor Who Explained
as Self
Doctor Who: Farewell to Matt Smith

Mysterious Island
as Young Captain Nemo

Xtinction: Predator X
as Dr. Charles LeBlanc

Broken
as Malcolm

Unstoppable
as Leitch

Megalodon
as Mitchell Parks

Evil Eyes
as Peter

Deep Shock
as Chomsky

Secret Level
as Astropath / Ultramarines Orbital Command (voice) · 1 ep.

Walker Independence
as Hagan · 5 ep.

Doom Patrol
as Willoughby Kipling · 12 ep.

MacGyver
as Fake Dr. Zito · 1 ep.

White Collar
as Curtis Hagen · 6 ep.

Warehouse 13
as Benedict Valda · 6 ep.

Dollhouse
as Tanaka · 3 ep.

Leverage
as Jim Sterling · 7 ep.

In Plain Sight
as Russell · 1 ep.

The Middleman
as Manservant Neville · 2 ep.
24
2001