Mark Andreas Sheppard (born May 30, 1964) is a British actor and musician, born in London of an Irish-German background. His television work includes an episode of The X-Files, a year on the action series Soldier of Fortune, guest-starring and recurring roles on The Practice, The Invisible Man, Special Unit 2, JAG, Star Trek: Voyager, The Chronicle, Monk, Las Vegas, CSI: NY and CSI: Crime Scene Investigation, among others. He played Badger, a semi-comical cockney-style crime boss in the short-lived Joss Whedon show Firefly and later cast again in another Joss Whedon show, Dollhouse as Paul Ballard's dismissive FBI superior.

He has appeared as a villain in season five of the Fox show 24 and as Patricia Arquette's serial-killer nemesis on Medium. He appeared as Romo Lampkin in seasons three and four of Battlestar Galactica, and had a recurring role as Manservant Neville in ABC Family's short-lived cult hit The Middleman. He has been seen as Anthony Anthros on Bionic Woman, as Sterling the nemesis character on Leverage, as the demon Crowley on Supernatural, and as a bank robber on an episode of Burn Notice.

He appeared in the pilot episode of the USA series White Collar as a villainous master forger and in NBC's Chuck as the Director of The Ring criminal organization. Most recently, he appeared in the SyFy series Warehouse 13 as Regent Benedict Valda. He currently resides in Los Angeles with his wife Jessica and two sons, Maximilian and William.

Son of actor W. Morgan Sheppard. .

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