Patrick Stewart was a celebrated actor whose career spanned decades of film, television, and theater. He became a household name playing Professor Charles Xavier in the X-Men films, but his work also included decades of live performances with the Royal Shakespeare Company and memorable roles as Gurney Halleck in Dune (1984) and King Richard in Robin Hood: Men in Tights (1993). But, of course, for millions of fans, he'll always be Captain Jean-Luc Picard in Star Trek: The Next Generation.