Question: Who wrote the "Head of State" episode?
SQL: SELECT "Written By" FROM "1-15861819-1" WHERE "Title" = '"Head of State"';

Question: The "Head of State" episode was authored by which person?
SQL: SELECT "Written By" FROM "1-15861819-1" WHERE "Title" = '"Head of State"';

Question: Who was the director of the episode "Graduation Day: Class of 2105"?
SQL: SELECT "Directed by" FROM "1-15861819-1" WHERE "Title" = '"Graduation Day: Class of 2105"';