Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_201_39 ( id number, "no" number, "title" text, "directed by" text, "released" number )

### Question ###
which person has directed most of the titles ?

### Accurate SQL ###

SELECT "directed by" FROM table_201_39 GROUP BY "directed by" ORDER BY COUNT("title") DESC LIMIT 1