CREATE TABLE table_2766 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT, "U.S. viewers  ( millions ) " TEXT)

Who wrote the episode directed by Ken Whittingham?
SELECT "Written by" FROM table_2766 WHERE "Directed by" = 'Ken Whittingham'
SELECT "Written by" FROM "table_2766" WHERE "Directed by" = 'Ken Whittingham'