Who was the director when the writer was John Sullivan?
CREATE TABLE table_17641206_4 (directed_by VARCHAR, written_by VARCHAR)
SELECT directed_by FROM table_17641206_4 WHERE written_by = "John Sullivan"
### Context: CREATE TABLE table_17641206_4 (directed_by VARCHAR, written_by VARCHAR) ### Question: Who was the director when the writer was John Sullivan? ### Answer: SELECT directed_by FROM table_17641206_4 WHERE written_by = "John Sullivan"