Who directed 'You Can't Take It with You', the Best Picture winner for 1938?

Who directed 'The Great Ziegfeld', the Best Picture winner for 1936? Which film won the Academy Award for Best Picture for 1937? Who directed 'The Life of Emile Zola', the Best Picture winner for 1937? Which film won the Academy Award for Best Picture for 1938? Which film won the Academy Award for Best Picture for 1940? Who directed 'Rebecca', the Best Picture winner for 1940? Which film won the Academy Award for Best Picture for 1941? Who directed 'How Green Was My Valley', the Best Picture winner for 1941?