In 'NYPD Blue', which actor played Detective Andy Sipowicz?

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 'ER', which actor played Dr. Doug Ross? 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? In 'Lonesome Dove', which two actors played the retired Texas Rangers?