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Mark A. Sheppard is a British actor and musician, born in London of an Irish-German background. He currently resides in Los Angeles with his wife Jessica and two sons, Maximilian and William.

At fifteen he became a professional musician and enjoyed many years as a recording and touring artist with bands including Robyn Hitchcock, The TV personalities and the Irish group Light a Big Fire. As a session musician, he recorded albums for many groups throughout Europe and eventually moved to the US, forming the LA group School of Fish. He was invited to audition for the American production of the play Cock and Bull Story (directed by Midnight Express author Billy Hayes), for which-he won numerous awards including the 1992 LA Drama Critics Circle award and the LA Weekly and Dramalogue awards.

His television work includes the "Fire" episode of The X-Files, a year on the Jerry Bruckheimer action series Soldier of Fortune, guest-star and recurring roles on CSI, The Practice, Firefly, Special Unit 2, JAG, Star Trek: Voyager, The Chronicle, Monk, Las Vegas and CSI: NY, among others. He has most recently been seen as a villain in season five of the Fox show 24 and as Patricia Arquette's serial-killer nemesis on Medium. He appears as a guest star during the last three episodes of season three of the re-imagined Battlestar Galactica.

His film credits include the Jim Sheridan film In the Name of the Father, starring opposite Daniel Day-Lewis and Emma Thompson as Guildford Four member Patrick Armstrong, the romantic comedy Lover's Knot, the Russian historical drama Out of the Cold, the thriller Unstoppable and with Heather Graham and Jeremy Sisto in the dark independent, Broken.

His father is the noted character actor W. Morgan Sheppard, whom he directed in the film Room 101 and with whom he co-stars in the psychological thriller Netherworld, which he also co-produced.

• Mark Sheppard at the Internet Movie Database