hurt on Superman when "Man of Steel" hits theaters this weekend.
If you're a fan of HBO's "Boardwalk Empire," you already know Shannon well as the overzealous government agent Nelson Van Alden. You may also know him for the brilliant reading of that deranged sorority letter.
However, if you haven't seen any of his movies, we're happy to give you a brief overview of the talented (and Oscar-nominated) Chicago native. Below, we provide a guide to Shannon's 10 most recognizable roles.