CREATE TABLE table_27837 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

Who direcred the episode with production code 7d03?
SELECT "Directed by" FROM table_27837 WHERE "Production code" = '7D03'
SELECT "Directed by" FROM "table_27837" WHERE "Production code" = '7D03'