Who wrote the episode that aired on September 26, 2010?
CREATE TABLE "table1_27169029_1" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_millions" text
);
SELECT "written_by" FROM "table1_27169029_1" WHERE "original_air_date"='September 26, 2010';