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_15748 ( "Title" text, "Directed by" text, "Written by" text, "Original air date" text, "Prod. code" real )

### Question ###
Who wrote the episode with a production code greater than 1.4 direcyed by rick wallace?

### Accurate SQL ###

SELECT "Written by" FROM table_15748 WHERE "Prod. code" > '1.4' AND "Directed by" = 'rick wallace'