Who directed the episode that had 0.54 million U.S. viewers?
CREATE TABLE table_26914076_4 (
    directed_by VARCHAR,
    us_viewers__millions_ VARCHAR
)
SELECT directed_by FROM table_26914076_4 WHERE us_viewers__millions_ = "0.54"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Who directed the episode that had 0.54 million U.S. viewers? ### Input: CREATE TABLE table_26914076_4 (
    directed_by VARCHAR,
    us_viewers__millions_ VARCHAR
) ### Response: SELECT directed_by FROM table_26914076_4 WHERE us_viewers__millions_ = "0.54"