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_30 (first_aired VARCHAR, role VARCHAR)
### Question:
What's the first aired date when Professor Hubert Whitehead was the role?
### Answer:
SELECT first_aired FROM table_name_30 WHERE role = "professor hubert whitehead"