CREATE TABLE table_14562722_1 (directed_by VARCHAR, written_by VARCHAR)

Who directed all the episodes that were written by aaron ehasz & john o'bryan?
SELECT directed_by FROM table_14562722_1 WHERE written_by = "Aaron Ehasz & John O'Bryan"
SELECT "directed_by" FROM "table_14562722_1" WHERE "Aaron Ehasz & John O'Bryan" = "written_by"