Before finding his niche as a character actor in numerous films and television shows, the multi-talented Mark A. Sheppard first worked for many years as a professional musician. At the young age of 15, Sheppard followed his musical dreams, eventually finding work as a session musician and touring member for critically acclaimed acts like Robyn Hitchcock and Television Personalities. But upon taking a part in a production of the stage play "Cock and Bull Story", Sheppard found a second passion--as an actor. In the early '90s, he found a handful of roles on television, including a one-off spot on the creepy sci-fi classic "The X-Files", but in 1993, he also made his feature film debut with a supporting role in the Daniel Day-Lewis-starring bio-drama "In the Name of the Father". Most of Sheppard's work in the '90s came on television, and most of the shows themselves were of the obscure or low-key variety. But in 1997, the actor landed his first major breakthrough, co-starring as Christopher Yates on the Primetime Emmy-nominated adventure "Soldiers of Fortune". Though Sheppard has continued to find supporting roles on the big screen, his best work has been on television, including one-off roles on shows like the crime-dramas "The Practice" and "CSI: NY" and multi-episode stints on the tense action-drama "24" and the sci-fi smash "Battlestar Galactica".