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_17655 ( "Series #" real, "Season #" real, "Title" text, "Directed by" text, "Written by" text, "Original air date" text, "Total viewers (in millions)" text )

### Question ###
What is the total number of titles written by Casey Johnson?

### Accurate SQL ###

SELECT COUNT("Title") FROM table_17655 WHERE "Written by" = 'Casey Johnson'