Getting his start in forgettable grade-B movies and so-called “other man” roles, actor Viggo Mortensen made a slow, steady climb up the ranks to become one of Hollywood’s most reliable and in-demand talents. Though he had little trouble finding work, Mortensen spent a good deal of time looking for that one breakthrough that would catapult his career. That springboard came with a leading role in the epic “Lord of the Rings” trilogy (2001-03), in which he played a heroic, but displaced king in a fictional land beset by evil. Because of his being a central character in one of the biggest, most