CREATE TABLE table_30120 ("Episode #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Originalairdate" CLOB, "Viewers  ( millions ) " CLOB)

Who directed the episode with 6.37 million viewers?
SELECT "Directed by" FROM table_30120 WHERE "Viewers (millions)" = '6.37'
SELECT "Directed by" FROM "table_30120" WHERE "Viewers (millions)" = '6.37'