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_18734298_1 (no_in_series VARCHAR, directed_by VARCHAR)
### Question:
How many series were directed by Rob Renzetti?
### Answer:
SELECT COUNT(no_in_series) FROM table_18734298_1 WHERE directed_by = "Rob Renzetti"