Which head coach led the New York Giants to victory in Super Bowl XXI?

In what year was Super Bowl XX played? Which team did the New York Giants defeat in Super Bowl XXI? Phil Simms was named MVP of which Super Bowl? In which city was Super Bowl XXI played? In what year was Super Bowl XXI played? Which team did the Washington Redskins defeat in Super Bowl XXII? Doug Williams was named MVP of which Super Bowl? In which city was Super Bowl XXII played?