CREATE TABLE table_2618152_1 (written_by VARCHAR2, original_air_date VARCHAR2)

The episode with original air date January 13, 1999 is written by who?
SELECT written_by FROM table_2618152_1 WHERE original_air_date = "January 13, 1999"
SELECT "written_by" FROM "table_2618152_1" WHERE "January 13, 1999" = "original_air_date"