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_22424 ( "No. in series" text, "Title" text, "Directed By" text, "Written By" text, "air date" text, "Production code" text )

### Question ###
When arthur heinemann is the writer who is the director?

### Accurate SQL ###

SELECT "Directed By" FROM table_22424 WHERE "Written By" = 'Arthur Heinemann'