user: Question: Who directed series #4 that was teleplayed by David Simon?
Columns: ['Series #', 'Title', 'Story by', 'Teleplay by', 'Directed by', 'Original air date']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '" The Target "', 'David Simon & Ed Burns', 'David Simon', 'Clark Johnson', 'June2,2002']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "Teleplay by" = 'David Simon' AND "Series #" = 4.0;