CREATE TABLE table_74174 ("Series #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" FLOAT, "U.S. viewers  ( million ) " CLOB)

What is the highest series # directed by ken whittingham?
SELECT MAX("Series #") FROM table_74174 WHERE "Directed by" = 'Ken Whittingham'
SELECT MAX("Series #") FROM "table_74174" WHERE "Directed by" = 'Ken Whittingham'