SELECT "Directed by" FROM table_25515 WHERE "Original air date" = 'February 16, 1999'
Who directed the episode that originally aired on February 16, 1999?
CREATE TABLE table_25515 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text
)