What is the name of the episode written by glen mazzara?
CREATE TABLE "table1_30030477_1" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "viewers_million" text
);
SELECT "title" FROM "table1_30030477_1" WHERE "written_by"='Glen Mazzara';