CREATE TABLE table_18424435_5 (directed_by VARCHAR, us_air_date VARCHAR)

Who directed the episode that aired on July 29, 2011?
SELECT directed_by FROM table_18424435_5 WHERE us_air_date = "July 29, 2011"
SELECT "directed_by" FROM "table_18424435_5" WHERE "July 29, 2011" = "us_air_date"