Table: tv_episode_data_26
Columns: no_in_series
no_in_season
title
directed_by
written_by
originalairdate
tv_broadcast

Question: Who wrote the "Head of State" episode?
SQL: SELECT "written_by" FROM tv_episode_data_26 WHERE "title" = '"Head of State"'

Question: The "Head of State" episode was authored by which person?
SQL: SELECT "written_by" FROM tv_episode_data_26 WHERE "title" = '"Head of State"'

Question: Who was the director of the episode "graduation day: class of 2105"?
SQL: SELECT "directed_by" FROM tv_episode_data_26 WHERE "title" = '"Graduation Day: Class of 2105"'