Rob Marshall—no relation to Gary Marshall, Penny Marshall, or Marshall Mathers—directed Chicago. As a young whippersnapper, he danced in Broadway shows, but after injuring himself in Cats, he went on to his second (of nine?) lives, in choreography and directing.
After directing a few TV adaptations of musicals, including Cinderella (1997) with Brandy and Whitney Houston, Marshall debuted on the silver screen with Chicago. And what a debut it was, winning the Director Guild of America trophy and being nominated for an Academy Award (but losing to Roman Polanski).
Marshall went on to direct more musicals—Nine (2009) and Into the Woods (2014)—and non-musicals—Memoirs of a Geisha (2005) and Pirates of the Caribbean: On Stranger Tides (2011).