CREATE TABLE table_73163 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( millions ) " TEXT)

Who directed the episode with production code 4akj08?
SELECT "Directed by" FROM table_73163 WHERE "Production code" = '4AKJ08'
SELECT "Directed by" FROM "table_73163" WHERE "Production code" = '4AKJ08'