CREATE TABLE "table1_12451376_1" (
  "series_ep_num" real,
  "title" text,
  "director" text,
  "writer_s" text,
  "original_airdate" text,
  "production_code" real
);

Question: Who wrote the episode when the director was dean white?
SQL: SELECT "writer_s" FROM "table1_12451376_1" WHERE "director"='Dean White';