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Miller's first starring role was as the sensitive and introverted David in ABC's mini-series Dinotopia. After appearing in a few minor television roles, he moved on to co-star in the 2003 film The Human Stain, playing the younger version of Anthony Hopkins' character. Miller's first TV appearance was as student-turned-sea monster Gage Petronzi on Buffy the Vampire Slayer ("Go Fish", 1998).

Miller further enhanced his profile in 2005 by obtaining the starring role as Michael Scofield in Fox Network's television drama Prison Break, in which he played the role of a caring brother who created an elaborate scheme to help his brother, Lincoln Burrows (Dominic Purcell) escape death row after being found guilty of a crime he did not commit. Prison Break is currently in its third season. His performance in the show earned him a 2005 Golden Globe nomination for Best Actor in a Dramatic Series.

(wikipedia.org)