 His television work includes the "Fire" episode of "The X-Files", a year on the Jerry Bruckheimer action series "Soldier of Fortune", guest-starring and recurring roles on "The Practice", "The Invisible Man", "Special Unit 2", "JAG", "", "The Chronicle", "Monk", "Las Vegas", "", "Chuck," "" and "White Collar," among others.Mark played a demon named Arnon on an episode titled
"Witches in Tights" on the TV series "Charmed".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.