CREATE TABLE table_16951593_1 (written_by VARCHAR2, us_viewers__millions_ VARCHAR2)

Name who wrote the episode that had 7.56 million viewers
SELECT written_by FROM table_16951593_1 WHERE us_viewers__millions_ = "7.56"
SELECT "written_by" FROM "table_16951593_1" WHERE "7.56" = "us_viewers__millions_"