he is familiar to movie audiences from his roles in "runaway jury", "apt pupil", and his role in the "x-men" movie franchise as senator robert kelly in the first film and as a shapeshifting impostor in "x2". he was the fanatical reverened samuel parris in arthur miller's screen adaptation of his play "the crucible". davison also portrayed a rich philanthropist in the movie "christmas angel". davison's many television credits include "hunter" (in which he was a semi-regular for at least one season), "marcus welby, m.d.", "love, american style", "the waltons", "lou grant", "murder, she wrote", "designing women", "seinfeld", "chicago hope", "", "v: the series", "", "", "battlestar galactica", "lost", "", "ghost whisperer", "castle", "hawaii five-0", the stephen king mini-series "kingdom hospital", and a recurring role on "the practice". davison also had the recurring role of defense attorney doug hellman in "close to home".