Joseph Leonard Gordon-Levitt (born February 17, 1981) is an American actor whose career as both a child and adult has included television series, theatrical films, and stage performances. He is perhaps known for his roles as Tom Hansen in the 2009 indie (500) Days of Summer, as Arthur in Christopher Nolan's sci-fi Inception, as Cameron James in 10 Things I Hate About You and as Rex Lewis/The Doctor/Cobra Commander in G.I. Joe: The Rise of Cobra..