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_25716399_1 ( written_by VARCHAR, original_air_date VARCHAR )

### Question ###
Who wrote the episode where the original air date is july20,2007?

### Accurate SQL ###

SELECT written_by FROM table_25716399_1 WHERE original_air_date = "July20,2007"