CREATE TABLE table_1563 ("No. in series" TEXT, "No. in season" TEXT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( millions ) " TEXT)

Name who wrote the episode that had 7.56 million viewers
SELECT "Written by" FROM table_1563 WHERE "U.S. viewers (millions)" = '7.56'
SELECT "Written by" FROM "table_1563" WHERE "U.S. viewers (millions)" = '7.56'