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_28194879_1 (_number INTEGER, written_by VARCHAR)

### Question ###
What is the last number in season of the episodes written by Dan Vebber?

### Accurate SQL ###

SELECT MAX(_number) FROM table_28194879_1 WHERE written_by = "Dan Vebber"