Who directed 'An American in Paris', the Best Picture winner for 1951?

Which film won the Academy Award for Best Picture for 1949? Who directed 'All the King's Men', the Best Picture winner for 1949? Which film won the Academy Award for Best Picture for 1950? Which film won the Academy Award for Best Picture for 1951? Which film won the Academy Award for Best Picture for 1952? Who directed 'The Greatest Show on Earth', the Best Picture winner for 1952? Which film won the Academy Award for Best Picture for 1953? Who directed 'From Here to Eternity', the Best Picture winner for 1953?