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_name_17 (producer VARCHAR, author VARCHAR, narrator VARCHAR, year VARCHAR)

### Question ###
who is the producer when the narrator is katherine kellgren, the year is before 2013 and the author is karen cushman?

### Accurate SQL ###

SELECT producer FROM table_name_17 WHERE narrator = "katherine kellgren" AND year < 2013 AND author = "karen cushman"