In 'ER', which actor played Dr. Doug Ross?

In 'Scrubs', at which hospital do the doctors work? In 'House', at which teaching hospital does Dr. House work? In 'Grey's Anatomy', what is Meredith Grey's surgical specialty? In 'Grey's Anatomy', what nickname is given to Dr. Derek Shepherd? In 'NYPD Blue', which actor played Detective Andy Sipowicz? In 'The Shield', which actor played corrupt detective Vic Mackey? In 'Justified', which actor played U.S. Marshal Raylan Givens? In 'Deadwood', in which territory is the series set?