Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_52 (directed_by VARCHAR, written_by VARCHAR, original_airdate VARCHAR)
### Question:
Who directed the episode written by Dan Serafin and aired on July 23, 2008?
### Answer:
SELECT directed_by FROM table_name_52 WHERE written_by = "dan serafin" AND original_airdate = "july 23, 2008"