In 2014, Miller became an advocate to finding treatment for the disease Sanfilippo syndrome, following a case with five-year-old Jonah Weishaar.
He is set to address the Congressional caucus in Washington, D.
He costarred in the film Love, Honour and Obey as Johnny, a London street kid getting mixed up with a notorious British gangster.
Also in 2000, he appeared as Simon Sheppard in Wes Craven's Dracula 2000.
He has appeared in several theatrical productions on Broadway, most notably After Miss Julie and Frankenstein, the latter of which earned him an Olivier Award for Best Actor.He participated in training for the event in Norway, which was televised for a BBC2 documentary series On Thin Ice. In November 1999, he played Brito in Paul Corcoran's Four Nights in Knaresborough at the Tricycle Theatre, London.In March 2011, at the Royal National Theatre, he played both Victor Frankenstein and Frankenstein's Monster on alternate nights, opposite Benedict Cumberbatch, in a stage adaptation of Frankenstein.Miller later revealed he had been offered a contract to remain on the show but declined: "It was five weeks' work and I made more money there than I ever had in my life. He then starred alongside Ray Liotta in the CBS drama Smith.However, the show was canceled after only seven episodes.Of course, the others are from all over Scotland and have different accents themselves, so I've tried to just pick up a general, composite accent." In 1997, he played Billy Prior in the film adaptation of Pat Barker's World War I novel Regeneration.