What are the movies that are written and dircted by  john sullivan  with the airdate of 15january2009.
CREATE TABLE "table1_17641206_8" (
  "episode" real,
  "original_title" text,
  "directed_by" text,
  "written_by" text,
  "original_airdate" text,
  "duration" text,
  "viewership" text
);
SELECT "directed_by" FROM "table1_17641206_8" WHERE "written_by"='John Sullivan' AND "original_airdate"='15January2009';