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_29102100_1 ( prod_code INTEGER, directed_by VARCHAR )

### Question ###
What was the production code of the episode directed by Rondell Sheridan?

### Accurate SQL ###

SELECT MAX(prod_code) FROM table_29102100_1 WHERE directed_by = "Rondell Sheridan"