Born in Dunoon, Scotland, he initially pursued a career in insurance but soon turned to the arts, performing in London's experimental theater scene. He gained prominence on British television as the seventh incarnation of the Doctor in "Doctor Who" from 1987 to 1989. Known for his whimsical yet dark portrayal, he revitalized the series. Later, he appeared as Radagast in Peter Jackson's "The Hobbit" film series, showcasing his versatility across genres.