Joss Whedon is known for casting the same actors throughout many of his shows and Mark is no exception. Joss has cast this Firefly alum to appear in his highly anticipated new series Dollhouse.
His role as Badger on Firefly was originally written by Joss Whedon for himself; however Mark was unaware of that fact until the pilot for the show, Serenity, was shot.
At 15, he became a professional musician and enjoyed many years as a recording and touring artist with bands including Robyn Hitchcock, Television Personalities and the Irish group Light a Big Fire.
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.
He has worked with actor Adam Baldwin in four projects: Lover's Knot (1996), Farewell, My Love (2001), Firefly (2002), and Evil Eyes (2004).
Mark: (On what it was like coming in to do such a large part on Battlestar Galactica, a show with an already established cast)
Once they got past the, 'Who is this guy and why does he have all this cool stuff to say?', Jamie [Bamber], James [Olmos] and myself, we became known as The Three Amigos, after ten or fifteen minutes. All of our stuff was together for three episodes. It was a wonderful experience working with Jamie and James. Two of the smartest men I've ever met.
Mark: (On what it was like to work with Joss Whedon on Firefly)
Smart man, smart man. He directed me in Serenity. Knows what he wants and goes out of his way to get the best from everyone. I've yet to meet anyone who doesn't like him. I don't know how he juggles three shows. His dialogue just amazes me. He doesn't waste words. It's tricky, though. If you miss a beat you're screwed. If you get it right, it sizzles. He makes me smile - all that cockney dialogue. Swearing in Chinese. Right on the money.
Mark: (When he asked if would like to appear on Buffy and/or Angel)
Love to. I asked Joss [Whedon] if he had any "pull" on either of those shows, he told me he "knew a guy" so I pitched a Badger/Buffy crossover. He said "No Way".
Mark: (On if he knew Joss Whedon or any other members of the cast before he joined the cast of Firefly?)
I have worked with Adam [Baldwin] more than once. Good actor. TALL actor. Between him and Nathan [Fillion], I feel like a midget on that bloody set.