Mark Andreas Sheppard is an English actor and musician, born in London of an Irish-German background. He is often credited as "Mark A. Sheppard". Sheppard is best known for his recurring roles as the demon Crowley on Supernatural, 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.
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